To find the surface area of the rectangular prism, we need to calculate the area of each of the six sides and then add them together. The area of each of the four walls is the product of the length and height, which gives us:
16 feet × 11 feet = 176 square feet (for the two longest walls)
14 feet × 11 feet = 154 square feet (for the two shorter walls)
The area of the ceiling and floor is the product of the length and width, which gives us:
16 feet × 14 feet = 224 square feet (for the ceiling)
16 feet × 14 feet = 224 square feet (for the floor)
To find the total surface area, we add up the areas of all six sides:
176 + 176 + 154 + 154 + 224 + 224 = 1104 square feet
Therefore, we need at least 1104/100 = 11.04 pints of paint to cover the walls of the room. Rounding up to the nearest whole pint, we need 12 pints of paint.
the following statements is NOT true for the parabola se
ph?
is of symmetry is x-1.
ertex is (1,-3).
"coefficient is positive.
rabola has two positive
Answer:
The statement "parabola has two positive x-intercepts" is not true for the parabola described.
Hope This Helps!
rosa has 15 quarters and 10 nickels. she buys juice from a store for herself and her friends. the juice costs 35 cents per can. she gives the cashier 2 3 of the quarters end 3 5 of the nickels. the cashier does not give her any change. how many cans of juice did she buy? cans
Rosa bought 8 cans of juice for herself and her friends.
To calculate how many cans of juice Rosa bought, we first need to calculate the total amount of money she gave the cashier:
2/3 of 15 quarters = (2/3) x 15 = 10 quarters (since each quarter is worth 25 cents,
10 quarters are worth 10 x 25 = 250 cents)
3/5 of 10 nickels = (3/5) x 10 = 6 nickels (since each nickel is worth 5 cents, 6 nickels are worth 6 x 5 = 30 cents)
Therefore, Rosa gave the cashier 250 + 30 = 280 cents.
Now, we need to find out how many cans of juice Rosa can buy with 280 cents:
1 can of juice costs 35 cents, so 280 cents can buy 280/35 = 8 cans of juice.
Therefore, Rosa bought 8 cans of juice for herself and her friends.
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The length of a rectangle is 3cm
greater than it's width. The area of the rectangle is 180cm ². Find the
length and the width.
in a hypothetical study, 200 patients with breast cancer were treated by surgery and another 200 patients with breast cancer were treated by radiation therapy. the treatment methods were randomly assigned. all patients were followed for 2 years, and the mortality rates between the two groups of patients were compared at the end of the follow-up. this study is a(n)
RCTs are considered one of the gold standards for evaluating the effectiveness of medical interventions because they can provide strong evidence of causality.
What type of study design was used in a hypothetical study ?The study described in the question is a randomized controlled trial (RCT). An RCT is a type of experimental study where participants are randomly assigned to different groups, and the effect of an intervention is evaluated by comparing outcomes between the groups. In this case, the intervention is the type of treatment (surgery vs radiation therapy), and the outcome of interest is the mortality rate after 2 years.
Random assignment of patients to treatment groups helps to reduce the influence of confounding variables and biases, thus allowing a more accurate assessment of the intervention's effects. In addition, by following patients over a specific period of time, the study can provide information about the long-term effects of the treatment.
Overall, RCTs are considered one of the gold standards for evaluating the effectiveness of medical interventions because they can provide strong evidence of causality.
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I need step by step detailed solution to the given question.
we can shown that the areas of △PMS and △SOR are equal, and the areas of △MQT and △NRT are equal,
we can then conclude that △PMS+△MQT = △SOR + △NRT.
How do we calculate?We will label the points in the figure as follows:
PQ = RS (given that PQRS is a parallelogram)
MN = OS (given that MNOS is a parallelogram)
T is the point of intersection of MQ and PR
R is the point of intersection of PS and NT
considering △PMS and △SOR. We can see that they share a base, PS, and that the heights of both triangles are equal, since PS is parallel to MN and therefore the distance between PS and MN is the same at both ends. Therefore, the areas of these two triangles are equal.
Also considering △MQT and △NRT.
It is obvious that they share a base, QT, and that the heights of both triangles are equal, since QT is parallel to RS and therefore the distance between QT and RS is the same at both ends.
Therefore, the areas of these two triangles are also equal.
Since we have shown that the areas of △PMS and △SOR are equal, and the areas of △MQT and △NRT are equal, we can conclude that △PMS+△MQT = △SOR + △NRT.
This was using the properties of parallelograms and the fact that the triangles share a common base with equal heights.
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RSM WORK HELLLPPP
|x-7|=x-7
solve the equation
PLEASE HELP
Answer: x≥7
Step-by-step explanation:
Given: ABC is a right triangle with right angle C. AC=15 centimeters and m∠A=40∘.
What is BC ?
To find the length of side BC, we'll use right-triangle trigonometry as follows:
The value of the tangent function for the measure of angle A = (the length of the side opposite angle A)/(the length of the side adjacent to angle A)
tan 40° = BC/AC
tan 40° = BC/15 cm
Now, multiply both sides by 15 cm:
(tan 40°)(15 cm) = (BC/15 cm)(15 cm)
(tan 40°)(15 cm) = (BC)(15 cm/15 cm)
(tan 40°)(15 cm) = (BC)(1)
BC = (tan 40°)(15 cm)
Now, using a table of values for the trigonometric functions for angles from 0° to 90° or using a scientific calculator, we find that tan 40° = .8391 (to 4 decimal places). Now, substituting on the right side we get:
BC = (.8391)(15 cm)
BC = 12.6 cm to the nearest tenth of a centimeter.
The function f(x)=−(x−3)2+7 is written in vertex form and shows that the vertex of the graph of f is located at (3, 7) . Each value of the f can be obtained from two different x -values except f(x)=7 . Which best explains why f(x)=7 is the output for only one input value?
f(x) = 7 is the output for only one input value, which is x = 3, because this is the only value that results in the maximum value of the function.
What is function?In mathematics, a function is a relationship between two sets of elements, called the domain and the range, such that each element in the domain is associated with a unique element in the range.
The function f(x) = −(x−3)²+7 is a quadratic function in vertex form. The vertex form of a quadratic function is given by f(x) = a(x - h)² + k, where (h, k) is the vertex of the parabola.
In this case, the vertex is (3, 7), which means that the parabola opens downwards and has a maximum value of 7. This also means that any value of f(x) less than 7 can be obtained from two different values of x, since the parabola is symmetric around its vertex.
However, f(x) = 7 is the maximum value of the function and can only be obtained for a single value of x, which is the x-coordinate of the vertex, namely x = 3. This is because the vertex is the highest point on the parabola, and any other value of x will result in a lower value of f(x).
Therefore, f(x) = 7 is the output for only one input value, which is x = 3, because this is the only value that results in the maximum value of the function.
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KN is tangent to circle � O at point � K. If m � � ⌢ = 9 8 ∘ m KA ⌢ =98 ∘ , find m ∠ � � � m∠AKN.
If m � � ⌢ = 9 8 ∘ m KA ⌢ =98 ∘, By solving we finf that m∠ � � � m∠AKN = m∠KNO = 90 degrees.
What is tangent?A tangent is a straight line or plane that intersects a curve or curved surface at exactly one point, called the point of tangency.
Since KN is tangent to circle O at K, we have ∠KNO = 90 degrees.
Also, ∠KAN is an external angle to triangle AKO, so we have:
∠KAN = ∠KAO + ∠AKO
But ∠KAO is equal to ∠KNO (since both are 90 degrees), so we can rewrite the above as:
∠KAN = ∠KNO + ∠AKO
Substituting in the given values, we get:
98 = 90 + ∠AKO
Solving for ∠AKO, we get:
∠AKO = 8 degrees
Finally, since ∠AKN is an inscribed angle that intercepts arc AN, we have:
m∠AKN = 1/2 × m(arc AN)
Since arc AN is the complement of arc KO (since they add up to a full circle), we have:
m(arc AN) = 180 - m(arc KO)
m(arc KO) = m∠KNO (since both arc KO and ∠KNO intercept the same segment KN)
m∠KNO = 90 degrees (as noted above)
Therefore, we have:
m(arc AN) = 180 - m∠KNO = 180 - 90 = 90 degrees
Substituting this into the formula for m∠AKN, we get:
m∠AKN = 1/2 × m(arc AN) = 1/2 × 90 = 45 degrees
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f(x)=x(x
2
+1)(x+5)(x
2
−3)
F(x) is a degree 6 polynomial having roots at x = 0, I -5, and 3.
As F(x) contains six elements in the form of (x-a), where an is a root, the degree of F(x) is 6. We discover that the roots are x=0, I -5, and 3 when we set each component to zero. By resolving each issue independently, their roots can be discovered. For instance, x=0, I is obtained from x(x2+1)=0. We obtain x=-5 from (x+5)=0. We get x=3 from (x2-3)=0. The roots of F(x) are significant because they reveal where the function crosses the x-axis and where its extrema are.
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5^2 over 53^3 in simplest form
After converting 5²/53³ in simplest form we get 25/148,877 as the correct answer.
To simplify the expression 5²/53³, we first evaluate the exponents of 5 and 53.
5² means 5 multiplied by itself, or 5 × 5, which equals 25.
53³ means 53 multiplied by itself three times, or 53 × 53 × 53. This can be calculated using a calculator or by multiplying the numbers out by hand. The result is 148,877.
So, we can rewrite the expression 5²/53³ as: 25/148,877
This expression cannot be simplified any further because 25 and 148,877 have no common factors other than 1.
Therefore, the expression in its simplest form is 25/148,877.
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if you are on a 2,000 calorie diet per day, and you are aiming for 20% to come from fat/lipids, how many grams of fat would you try to consume?
You should try to consume approximately 44.44 grams of fat per day.
To calculate how many grams of fat you should consume on a 2,000 calorie diet with 20% of calories coming from fat,
follow these steps:
Determine the total calories from fat:
20% of 2,000 calories = 0.20 x 2,000 = 400 calories from fat.
Convert calories to grams:
There are 9 calories in 1 gram of fat. To find out how many grams of fat you should
consume, divide the calories from fat by the calories per gram:
400 calories / 9 calories/gram = 44.44 grams of fat.
So, if you are on a 2,000 calorie diet and aiming for 20% of your calories to come from fat, you should try to consume
approximately 44.44 grams of fat per day.
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PLS HELPP ME NOWWWWW ASAP
Answer:
A
Step-by-step explanation:
the Least common factor is 12
17/3 (x-3/2) =-5/4
17/2x -17/2 =-5/4
12*17/3x -12*17/2 = 12*-5/4
4*17x - 6*17= 3*-5
68x -102= -15
68x= 102-15
68x= 87
x=87/68
can yall help me please?
The mean travel time for the 7 students is approximately 8.6 minutes, and the median travel time is 8.5 minutes.
To find the mean travel time, we need to add up all the travel times and divide by the total number of students:
Mean = (8 + 14 + 12 + 9 + 7 + 5 + 5) / 7
Mean = 60 / 7
Mean ≈ 8.6 (rounded to one decimal place)
So, the mean travel time for the 7 students is approximately 8.6 minutes.
To find the median travel time, we need to arrange the travel times in order from smallest to largest:
5, 5, 7, 8, 9, 12, 14
There are 7 students, so the median is the middle value. In this case, the middle value is the average of the 4th and 5th numbers:
Median = (8 + 9) / 2
Median = 8.5
So, the median travel time for the 7 students is 8.5 minutes.
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please help me!!!!
PLease hurry!!!!
The absolute value equation is |x - 11| = 6.
Howe to write the absolute value equation?Givent he values 5 and 17 on the numberr line, we want to write an absolute value equation in the form |x - c| = d.
Now, given two numbers a and b, we have that
c = (a + b)/2 and d = (b - a)/2So, given that
a = 5 and b = 17,we have that
c = (a + b)/2
= (5 + 17)/2
= 22/2
= 11
Also, given that
a = 5 and b = 17,we have that
d = (b - a)/2
= (17 - 5)/2
= 12/2
= 6
So, to write the absoiute value equation, we substitute the values of the variables into the equation
|x - c| = d.
So, substituting the values of the variables into the equation, we have that
|x - c| = d.
|x - 11| = 6.
So, the absolute value equation is |x - 11| = 6.
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Help me please, since there are two answers and I can’t get a good grade without both
The value of x for the equation I s derived to be equal to -0.8354 using logarithm.
How to evaluate for x using logarithmTaking the logarithm of both sides of the equation to base 10, we get:
log(4^(-x + 4)) = log(17^(-5x))
Using the power rule of logarithms, we can simplify both sides of the equation as;
(-x + 4) log(4) = (-5x) log(17)
Distributing the lig(4) and log(17), we get:
-xlog(4) + 4log(4) = -5xlog(17) {all in base 10}
5x log(17) - xlog(4) = 4 log(4) {collect like terms}
x[5log(17) - log(4)] = 4log(4)
x = 4log(4)/[5log(17) - log(4)] {divide through by the coefficient of x}
x ≈ -0.8354
Therefore, the value of x for the equation I s derived to be equal to -0.8354 using logarithm.
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if we didn't know the proportion of students that expect to drop the class, and we wanted to estimate a 95% ci with a margin of error of 3%. then the sample size needed would be?
The required sample size is approximately 1068 students to estimate a 95% confidence interval with a margin of error of 3%
The estimate a 95% confidence interval with a margin of error of 3%, we need to determine the required sample size. We can do this using the following steps:
1. Identify the confidence level and margin of error: In this case, we want a 95% confidence interval, which corresponds to a z-score of 1.96 (found in a standard normal distribution table). The margin of error is 3% or 0.03.
2. Determine the maximum variance: Since we don't know the true proportion (p) of students expecting to drop the class, we need to assume the maximum variance, which occurs when p = 0.5. This will give us a conservative estimate for the required sample size.
3. Calculate the sample size:
Using the formula n =[tex](Z^2 * p * (1-p)) / E^2[/tex], where n is the sample size, Z is the z-score (1.96), p is the proportion (0.5), and E is the margin of error (0.03).
n =[tex] (1.96^2 * 0.5 * 0.5) / 0.03^2[/tex]
n ≈ [tex]1067.1[/tex]
4. Round up the sample size: Since we cannot have a fraction of a student, we round up the sample size to the nearest whole number.
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Find the error in the work below. Then show the correct calculation. 8/12x6= 8x1/12x6= 8x1/72= 8/72= 1/9
The error in the calculation above is that the order of operations was not followed correctly. Multiplication should be performed before division. the correct answer is [tex]4[/tex] , not [tex]1/9[/tex] .
What is the multiplication and division?The error in the calculation above is in the first step. When performing multiplication and division in the same step, you should always perform the multiplication before the division. This is known as the order of operations.
The correct calculation would be:
[tex]8/12 \times6 = (8/12) \times 6[/tex] (perform the multiplication first)
[tex]= (2/3) \times 6[/tex] (simplify the fraction)
[tex]= 12/3[/tex]
[tex]= 4[/tex]
The error in the calculation above is that the order of operations was not followed correctly. Multiplication should be performed before division.
The correct calculation is as follows:
[tex]8/12 \times 6 = (8/12) x\times6[/tex] // Multiplication first
[tex]= (2/3) \times 6 /[/tex] / Simplify 8/12 to 2/3
= [tex]12/3[/tex] // Multiply 2/3 by 6
= [tex]4[/tex] // Simplify 12/3 to 4
Therefore, the correct answer is [tex]4[/tex] , not [tex]1/9[/tex] .
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For the following problem write the simplest polynomial function with the given zeros: 2,
-1, and -8
Answer:
f(x) =x^2 - 3x^2 - 6x + 8.
Step-by-step explanation:
Write the equation of a line perpendicular to y= - 2/3x -1 that goes through (6,2)
Answer: y = (3/2)x - 7
Step-by-step explanation:To find the equation of a line perpendicular to another line, we need to know that the slopes of two perpendicular lines are negative reciprocals of each other. Therefore, the slope of the line we're looking for will be the negative reciprocal of -2/3, which is 3/2.
Now we can use the point-slope form of the equation of a line, which is y - y1 = m(x - x1), where (x1, y1) is a point on the line and m is the slope.
We know that the line we're looking for goes through the point (6,2), so x1 = 6 and y1 = 2. We also know that the slope is 3/2. Substituting these values into the point-slope form, we get:
y - 2 = (3/2)(x - 6)
Simplifying and putting the equation into slope-intercept form, we get:
y = (3/2)x - 7
So the equation of the line perpendicular to y = -2/3x -1 that goes through the point (6,2) is y = (3/2)x - 7.
Please help with give brainiliest to whoever gets it right.
For the given Cuboid, the width will be equal to 4.5 cm.
What exactly is a cuboid?
A cuboid is a three-dimensional solid shape that has six rectangular faces, where opposite faces are equal in size and shape. A cuboid is also known as a rectangular parallelepiped or rectangular prism.
In a cuboid, the three pairs of opposite faces are parallel to each other and perpendicular to the other pair of faces. The cuboid has eight vertices or corners, twelve edges, and six rectangular faces.
Now,
We can use the formula for the volume of a cuboid to find the missing dimension:
Volume = Length x Width x Height
In this case, we are given the length and height of the cuboid, but we do not know its width. Let's assume that the width of the cuboid is "w". Then, we can write the equation:
220.5 = 7 x w x 7
Simplifying this equation, we get:
220.5 = 49w
Dividing both sides by 49, we get:
w = 4.5
Therefore, the third dimension of the cuboid is:
Width = 4.5 cm
So, the cuboid has three dimensions of 7 x 4.5 x 7 cm.
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Which point is a vertex of the hyperbola?
O (1,-15)
O (1,-2)
O (1,3)
O (1,11)
Option C. is correct one, (1, 3) is a vertex (out of two) of the hyperbola.
Define the vertex of hyperbola?In a hyperbola, the vertex refers to the point where the transverse axis intersects the hyperbola. The transverse axis is the axis that passes through the two vertices of the hyperbola, and it is perpendicular to the imaginary axis that separates the two branches of the hyperbola.
There are two vertices in a hyperbola, one on each side of the imaginary axis. The distance from each vertex to the center of the hyperbola is equal to the value of the constant.
The question specifies that the dot on the hyperbola denotes the vertices in both graph,
They are (1,3) and (1,- 7)
However, (1,3) is on the given option of possible answers, while (1,-7) is not,
Thus , (1,3) is a vertex (out of two) of the hyperbola.
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URGENT! Will give brainliest :)
What is the first quartile of the data set represented by the box plot shown below?
A. 30
B. 18
C. 25
D. 45
Answer:
C. 25
Step-by-step explanation:
You want to know the first quartile as shown in the given box plot.
Box plotA box plot has vertical lines at (left to right) ...
minimumfirst quartilemedian (2nd quartile)third quartilemaximumThe left end of the "box" is the first quartile.
The first quartile of the dataset represented by this box plot is 25.
Jose used the equation h - 130 = 75 to find the height in feet h of a hot air balloon before it began to come down. What was the height of the hot air balloon before it began to come down?
h - 130 = 75 demonstrates that h = 205 is a legitimate solution to the equation of height of hot air balloon.
How is height determined via linear equation?
We must discover the solution to the equation h - 130 = 75 for h, where h is the height of the balloon in feet, in order to determine its height before it started to descend.
We can increase both sides of the equation by 130 to isolate h:
h - 130 + 130 = 75 + 130
Simplifying:
h = 205
As a result, the hot air balloon reached a height of 205 feet before starting to descend. By substituting h = 205 into the original equation and confirming that it is satisfied, we may confirm this:
h - 130 = 75
205 - 130 = 75\s75 = 75
This demonstrates that h = 205 is a legitimate solution to the equation and, consequently, the hot air balloon's actual height.
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What is the volume
of a pyramid with
sides of 22 inches and
30 inches, and a
of height of 15 inches?
Answer: 3300
Explanation: V=lwh/3=22x30x15/3=3300
a sample of 100 shoppers showed a sample mean waiting time of minutes. assume a population standard deviation of minutes. what is the -value?
A population standard deviation of 8.5 minutes. Then, the p-value is 0.0436.
We know the length of the show based on the assumption that shoppers spend an average of 8 minutes in line at the store checkout.
A sample of 100 buyers reported an average sample wait time of 8.5 minutes. For example, the population standard deviation is 3.2 minutes.
Null Hypothesis, H₀: μ =8 minutes {means that the actual mean waiting time does not differs from the standard}
Alternate Hypothesis, Hₐ: μ ≠ 8 minutes {means that the actual mean waiting time differs from the standard}
The test statistics that would be used here are One-sample z-test statistics as we know about the population standard deviation;
T.S. = x-μ/σ/√n ~ N(0,1)
where, X = sample mean waiting time = 8.5 minutes
σ = population standard deviation = 3.2 minutes
n = sample of shoppers = 100
So, test statistics = 8.5 -8/3.2/√100
= 1.75
The value of t-test statistics is 1.75.
Now, the P-value of the test statistics is given by;
P-value = P(Z > 1.71) = 1 - P(Z ≤ 1.75)
= 1 - 0.9568 = 0.0438
Complete Question:
A sample of 100 shoppers showed a sample mean waiting time of 8.5 minutes. Assume a population standard deviation of 3.2 minutes. What is the p-value?
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a researcher in campaign finance law wants to estimate the proportion of elementary, middle, and high school teachers who contributed to a candidate during a recent election cycle. given that no prior estimate of the population proportion is available, what is the minimum sample size such that the margin of error is no more than 0.04 for a 99% confidence interval?
Approximately, the minimum sample size required is n = 600.
What is the minimum sample size required to estimate the proportion?A researcher in campaign finance law wants to estimate the proportion of elementary, middle, and high school teachers who contributed to a candidate during a recent election cycle. Given that no prior estimate of the population proportion is available, the minimum sample size such that the margin of error is no more than 0.04 for a 99% confidence interval is 600.
How to determine the minimum sample size?We use the following formula : n = (Zα/2)^2 × p × q ÷ E^2where,α = 1 - 0.99 = 0.01Zα/2 = Z0.005 from the standard normal distribution table Zα/2 = 2.58 (approx.)p = 0.5, as we don't have any prior information regarding the population proportion. q = 1 - p = 1 - 0.5 = 0.5E = 0.04Substitute the values in the formula to get: n = (2.58)^2 × 0.5 × 0.5 ÷ (0.04)^2n = 661.56.
Approximately, the minimum sample size required is n = 600.
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Can someone PLEASE help me with this ASAP? it’s due today!! Do part A, B, and C. I will give brainliest!!
100 points and brainliest!!
The experimental probability for the numbers are:
P(3) = 1/12 (in fraction)
P(3) = 0.08 (in decimal)
P(3) ≈ 8% (in percentage)
P(6) = 3/12
P(6) = 0.25
P(6) = 25%
P(less than 4) = 6/12
P(less than 4) = 0.5
P(less than 4) = 50%
How to find the experimental probability?Probability is the likelihood of a desired event happening.
Experimental probability is a probability that relies mainly on a series of experiments.
Blake rolled a die 12 times and 3 appears once (Given in the table). The experimental probability for 3 will be:
P(3) = 1/12 (in fraction)
P(3) = 0.08 (in decimal)
P(3) ≈ 8% (in percentage)
Blake rolled a die 12 times and 6 appears 3 times (Given in the table). The experimental probability for 6 will be:
P(6) = 3/12
P(6) = 0.25
P(6) = 25%
The numbers less than are 1, 2 and 3. Six of the twelve outcome in the table are less than 4.
P(less than 4) = 6/12
P(less than 4) = 0.5
P(less than 4) = 50%
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plssss I will fail the whole course I beg u
A function is shown in the table. x g(x) −3 17 −1 −3 0 −4 2 13 Which of the following is a true statement for this function? (5 points) The function is increasing from x = −3 to x = −1. The function is increasing from x = −1 to x = 0. The function is decreasing from x = 0 to x = 2. The function is decreasing from x = −3 to x = −1.
Answer:
Step-by-step explanation:
in a study, 40% of adults questioned reported that their health was excellent. a researcher wishes to study thehealth of people living close to a nuclear power plant. among 13 adults randomly selected from this area, only3 reported that their health was excellent. find the probability that when 13 adults are randomly selected, 3 orfewer are in excellent health.a) 0.112 b) 0.169
If 40% of adults questioned reported that their health was excellent, then the probability that when 13 adults are randomly selected, 3 or fewer are in excellent-health is (b) 0.169.
The number of adults randomly selected is = 13 adults,
We need to find probability of getting 3 or fewer people reporting excellent health which is considered as success , in 13 trials
The probability of success = 0.4 ...because proportion of adults reporting excellent health in general population.
We use "binomial-probability" formula to calculate probability:
⇒ P(X ≤ 3) = ΣP(X = k), for k = 0, 1, 2, 3
where X = number of successes = people reporting excellent health and P(X = k) = probability of getting exactly k successes;
⇒ P(X = k) = C(n,k) × p^k × (1-p)^(n-k),
where n = number of trials, p = probability of success, and
substituting values,
We get,
⇒ P(X ≤ 3) = P(X = 0) + P(X = 1) + P(X = 2) + P(X = 3),
⇒ C(13,0) × (0.4)⁰ × (0.6)¹³ + C(13,1) × (0.4)¹ × (0.6)¹² + C(13,2) × (0.4)² × (0.6)¹¹ + C(13,3) × (0.4)³ × (0.6)¹⁰,
≈ 0.1686 ≈ 0.169.
Therefore, the required probability is approximately 0.169, the correct option is (b).
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