Using empirical rule, the approximate percentage of daily phone calls numbering between 42 and 52 is 68%.
A statistical principle known as the empirical rule, also known as the three-sigma rule or 68-95-99.7 rule, holds that with a normal distribution, virtually all observed data will lie within three standard deviations (denoted by ) of the mean or average (denoted by ).
The empirical rule specifically states that 68% of observations will fall inside the first standard deviation, 95% will fall within the first two standard deviations, and 99.7% will fall within the first three standard deviations.
Mean = 47
SD = 5
Using Empirical Formula ,approximate percentage of daily phone calls numbering between 42 and 52
Normal Distribution has bell shape curve
The Empirical Rule states that in a normal distribution
68% of the data falls with in one standard deviation ( -1 to 1)
95% of data falls with in two standard deviations, and (-2 to 2)
99.7% of data falls with in three standard deviations from the mean. (-3 to 3)
z score = ( Value - mean)/SD
Calculate z score for 60
Z = (42 - 47)/5
Z = -1
Calculate z score for 66
Z = (52 - 47)/5
Z = 1
As data lies between -1 and 1 hence with in one standard deviation from the mean Hence using Empirical data approximate percentage of daily phone calls numbering between 42 and 52 is 68%.
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johnny makes an initial deposit into a bank account that earns compound interest annually. what's the initial deposit? whats the common ratio? whats the interest rate? how much money is there after 8 years? please help me and please be specific!! thank youuu
1. The initial deposit is $10,000 since John deposited this amount to open the savings account.
2. The common ratio can be calculated using the formula for compound interest: A = P(1 + r/n)^(nt)
3. After 8 years, the amount will be $13,685.70 in the savings account.
How do we get how much money in account after 8 years?The formula which will be used to calculated the compound interest is A = P(1 + r/n)^(nt). For this problem, the interest is compounded annually, so n = 1.
The annual interest rate is 4%, or 0.04 as a decimal. Plugging these values into the formula, we get:
A = $10,000*(1 + 0.04/1)^(1*8)
A = $10,000*(1.04)^8
A = $10,000*1.36857
A = $13,685.70
Therefore, after 8 years, there will be $13,685.70 in the savings account.
Full question "John deposited $10,000 to open a new savings account that earned 4 percent annual interest, compounded interest. What's the initial deposit? whats the common ratio? whats the interest rate? how much money is there after 8 years?"
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How do I find the length of the arc?
The length of the arc of circle with radius 13m and with angle of arc [tex]2\pi /3[/tex]would be 13.6 meters.
What is an arc?The part of a circle's circumference known as an arc.It is defined by two endpoints on the circle and the points that lie on the circle between these endpoints.
An arc can be measured by its length, angle, or other properties, and is often used in the calculation of the perimeter and area of a sector of a circle.
Arcs can also be part of other curves, such as ellipses or parabolas, but they are most commonly associated with circles.
To find the length of an arc, you need to know the radius of the circle and the measure of the central angle subtended by the arc.
Arc length = (central angle / 360 degrees) x (2 x pi x radius)
where pi is approximately equal to 3.14.
For example, if the radius is 13m and the central angle is 60 degrees, then the length of the arc would be:
Arc length = (60 / 360) x (2 x 3.14 x 13) = 13.6 meters.
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What is the end behavior of function h? h(x)=-4x^2+11
We can conclude that the end behavior of the function [tex]$h(x)$[/tex] is that it approaches negative infinity as [tex]$x$[/tex] approaches either positive or negative infinity.
What is meant by end behavior?
End behavior refers to the behavior of a function as the input (usually denoted by x) becomes extremely large (approaches positive or negative infinity). It describes the trend of the function as the input approaches infinity or negative infinity, and is determined by the highest-degree term of the function.
To determine the end behavior of the function [tex]$h(x)=-4x^2+11$[/tex], we can use limits. Specifically, we can evaluate the limit of [tex]$h(x)$[/tex] as [tex]$x$[/tex] approaches positive infinity and as [tex]$x$[/tex] approaches negative infinity.
As [tex]$x$[/tex] approaches positive infinity, we have:
[tex]\lim_{x \to \infty} h(x)= \lim_{x \to \infty} (-4x^2+11) = - \infty[/tex]
This tells us that as [tex]$x$[/tex] gets larger and larger, the value of [tex]$h(x)$[/tex] becomes more and more negative, eventually approaching negative infinity.
Similarly, as [tex]$x$[/tex] approaches negative infinity, we have:
[tex]\lim_{x \to -\infty} h(x)= \lim_{x \to -\infty} (-4x^2+11) = - \infty[/tex]
This tells us that as [tex]$x$[/tex] gets more and more negative, the value of [tex]$h(x)$[/tex] becomes more and more negative, also approaching negative infinity.
Therefore, we can conclude that the end behavior of the function [tex]$h(x)$[/tex] is that it approaches negative infinity as [tex]$x$[/tex] approaches either positive or negative infinity.
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the slope of a street is 0.54. if it covers 28m of horizontal distance, what is the rise of the street?
Answer: i believe its 15.12
Step-by-step explanation:
How many hours after the chemical reaction starts are the concentrations of the two products equal?
Responses
0.6
1.0
1.5
2.0
Answer:0.6
Step-by-step explanation: because i got it correct
help please i dont get this
● < P=R " angles opp =sides"
●PQ =QR " Angles opposite = sides"
therefore PQR is an isosceles " 2 opp angles and sides are equal "
Figure ABCD is reflected across the x-axis.
What are the coordinates of A' , B' , C' , and D'
Answer: A'(-1,-4)B'(-5,-8)C'(-5,-4)D'(-4,-2)
Step-by-step explanation:
We have been given a graph of a quadrilateral and we are asked to find the coordinates of our quadrilateral after reflecting it across the x-axis.We can see that coordinates of quadrilateral ABCD are:A (-1,4),B (-5,8),C (-5,4),D (-4,2).
Since we know that rule for reflecting an image across x-axis is . This means that y-coordinates of our given image will be negative.So after reflecting our given quadrilateral across x-axis, coordinates will be:
A'(-1,-4)B'(-5,-8)C'(-5,-4)D'(-4,-2)
please help asap look at the screen shot to help
The mean class size at Mountain View School is 4.4 and at Seaside School is 4.2.
The median class size is 5 for both schools.
The range for Mountain View School is 12 and for Seaside School is 8.
The IQR for Mountain View School is 6 and for Seaside School is 3.
How do we solve this?To find the measures of center, we can calculate the mean and median for both schools.
Mountain View School:
Mean = (2+1+0+5+8+6+9+8+2+0+1+0+6)/15
Mean = 4.4
Median = 5
Seaside School:
Mean = (0+1+2+5+6+8+8+7+6+5+5+4+4+3+1+0)/15
Mean = 4.2
Median = 5
Part B:
To find the measures of variability, we can calculate the range and interquartile range (IQR) for both schools.
Mountain View School:
Range = largest value - smallest value = 12 - 0
Range = 12
IQR = Q3 - Q1 = 8 - 2 = 6
Seaside School:
Range = largest value - smallest value = 8 - 0
Range = 8
IQR = Q3 - Q1 = 7 - 4 = 3
Part C:
If we are interested in a smaller class size, Seaside School would be the better choice. The median class size is the same at both schools, but Seaside School has a smaller mean, which suggests that on average, class sizes are smaller.
Additionally, the range and IQR are both smaller for Seaside School, indicating less variability in class size.
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what is the slope of the line of best-fit in the scatterplot below?on a graph, a trend line goes through points (3, 12) and (6, 19).
The slope of the line of best fit in the scatterplot below can be determined using the formula for the slope of a line:
Slope = (y2-y1)/(x2-x1)
In this case, x1 = 3, y1 = 12, x2 = 6, y2 = 19. So, the slope of the line of best fit is (19 - 12) / (6 - 3), which equals 7/3 or 2.33.
The line of best fit is the line that best represents the data on a scatterplot. It is the line that is closest to all the data points in the graph. The slope of the line of best fit helps to indicate whether the data points are moving in a positive or negative direction. If the slope is positive, the data points are increasing, and if the slope is negative, the data points are decreasing.
A positive slope, like the one in this example, means that as x increases, y also increases. This means that in this case, as the x-values (3 and 6) increase, the y-values (12 and 19) also increase.
The slope of the line of best fit can also be used to make predictions about values of y, given values of x. For example, if x = 8, then y = 26, because the slope of the line of best fit is 2.33, and 8*2.33 = 19.8, which is approximately equal to 26.
Overall, the slope of the line of best fit on this scatterplot is 2.33, which is a positive number. This indicates that as the x-values increase, the y-values also increase, and it can also be used to make predictions about y-values, given x-values.
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How many unique triangles are there in the regular hexagon?
Answer:
Step-by-step explanation: There are 6 equilateral triangles in a regular hexagon by connecting the opposite vertices of a regular hexagon.
by how much must the sample size n be increased if the width of the ci (7.5) is to be halved? if the sample size is increased by a factor of 25, what effect will this have on the width of the interval? justify your assertions.
The width of the interval will be reduced to 1.5 if the sample size is increased by a factor of 25.
To find how much the sample size n must be increased if the width of the confidence interval is to be halved, use the following formula:
W = (zα/2 x σ/√n)W/2 = (zα/2 x σ/√n')
Where W is the initial width of the confidence interval,
zα/2 is the critical value of the standard normal distribution that corresponds to the level of significance α and the appropriate two-tailed area,
σ is the population standard deviation,
n is the initial sample size, and
n' is the new sample size needed to halve the width of the interval.
Rearranging the second equation to solve for n', we get:
n' = n(4)
So the sample size needs to be increased by a factor of 4, or 300% if the width of the confidence interval is to be halved.
If the sample size is increased by a factor of 25, the effect it will have on the width of the interval can be found using the following formula:
W' = (zα/2*σ/√25n) = (zα/2*σ/5√n)
The width of the interval will be divided by 5, or reduced to one-fifth of its initial value.
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Sarita has 38 inches of fringe to sew around a circular pillow. What is the approximate diameter of the largest pillow she can use?
The approximate diameter of the largest pillow Sarita can use is 12 inches.
Sarita has 38 inches of fringe to sew around a circular pillow.
To calculate the approximate diameter of the largest pillow she can use, we can use the formula 2 × (fringe length ÷ 3.14) = diameter. In this case, the diameter would be approximately 12 inches (38 ÷ 3.14 = 12.1).
To solve this problem, we need to divide the length of the fringe (38 inches) by the value of pi (3.14). Dividing 38 by 3.14 gives us 12.1. Since we are looking for the approximate diameter, we can round this number down to 12 inches.
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Solve the given equation for z and right the correct answer 4z + 9 = 29
g in a study, the sample is chosen by separating all cars by size, and selecting 10 of each size grouping what is the sampling method?
The sampling method used in the study where the sample is chosen by separating all cars by size, and selecting 10 of each size grouping is known as stratified random sampling.
Stratified random sampling is a method of sampling that involves dividing the population into smaller sub-groups known as strata. In this method, each stratum is composed of elements that have similar characteristics.
The strata could be based on demographic characteristics such as age, sex, education, and so on. Once the strata have been created, the next step is to select a sample from each of the strata to make up the final sample. The selection is done randomly, and the number of elements selected from each stratum is proportional to the size of the stratum. This ensures that the sample is representative of the entire population in terms of the different characteristics of the population.
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the radius of a circle is changing at .5 cm/sec. find the rate of change of the area when the radius is 4 cm.
The rate of change of the area of a circle when the radius is 4 cm is 4π cm2/sec.
This can be calculated using the formula for the area of a circle (A = πr2) and the chain rule for derivatives. The chain rule states that when the radius (r) changes, the area of a circle (A) is equal to 2πr times the rate of change of the radius (dr/dt).
Therefore, the rate of change of the area of a circle when the radius is 4 cm is equal to 2π(4 cm) × (0.5 cm/sec) = 4π cm2/sec.
Note that if the rate of change of the radius were different, the rate of change of the area would also be different. This formula can be used to calculate the rate of change of the area of a circle at any given radius, as long as the rate of change of the radius is known.
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if it is unstable, please change support at a to make stable structure. use the method of joints to calculate the force bd in the truss shown. question 2 (50 pts) find the forces in members cd and ce using the method of section. the support reactions have already been determined.
To make a stable structure, the method of joints can be used to calculate the force BD in the truss shown.
This method uses the equations of equilibrium to determine the forces in the members of a truss. To calculate the force BD, one needs to sum the moments about point A and equate them to zero.
The moment is given by M = FxD, where F is the force, and D is the perpendicular distance from the point of interest to the line of action of the force. Therefore, the force BD can be calculated using the equation:
MAB = 0 = (BD)(2) - (AE)(5)
BD = 5AE/2
To find the forces in members CD and CE using the method of sections, one needs to cut through the truss along a line passing through points C and E.
Then, the force in member CD can be found by using the equation of equilibrium, where the sum of the forces in the x-direction and the sum of the forces in the y-direction must be equal to zero. Similarly, the force in member CE can also be calculated using the same method.
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what percentage of known edible plants is cultivated or collected by humans for food? find that number on the infographic and divide by the total number of terrestrial plants known to be edible. (round your answer to the nearest whole number.)
The percentage of known edible plants is cultivated or collected by humans for food : 23%
We need to find the percentage of known edible plants is cultivated or collected by humans for food.
From the infographic, the number of known edible plants are 30,000
and the total number of terrestrial plants known to be edible is about 130000
We know that the percenage of 'x' out of 'n' is given by formula,
p = (x / n) × 100%
here, x = 30,000 and n = 130000
Using above formula of percentage:
p = (30,000/130000) × 100%
p ≈ 23%
the required percentage is: 23%
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The complete question is:
What percentage of known edible plants is cultivated or collected by humans for food? Find that number on the infographic and divide by the total number of terrestrial plants known to be edible. (Round your answer to the nearest whole number.)
two 99 percent confidence intervals will be constructed to estimate the difference in means of two populations, r and w. one confidence interval, i9 , will be constructed using samples of size 9 from each of r and w, and the other confidence interval, i81 , will be constructed using samples of size 81 from each of r and w. when all other things remain the same, which of the following describes the relationship between the two confidence intervals?A The width of Ig1 will be the width of Ig. B The width of 1x1 will be the width of Ig. C The width of 181 will be equal to the width of Ig. D The width of 181 will be 3 times the width of Ig. E The width of 181 will be 9 times the width of Ig.
The relationship between the two confidence intervals will be that the width of i81 will be 3 times the width of i9. So, the correct answer is option D.
What are confidence intervals?In statistics, a confidence interval is a range of values that is used to estimate the unknown population parameter. They are used to express the degree of uncertainty associated with a sample estimate of a population parameter.
Two 99 percent confidence intervals are going to be constructed to estimate the difference in means of two populations, r and w. One confidence interval, i9, is going to be constructed using samples of size 9 from each of r and w.
The other confidence interval, i81, is going to be constructed using samples of size 81 from each of r and w. When all other things remain the same, the width of 181 will be 3 times the width of Ig.
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the mean gpa for 127 residents of the local apartment complex is 1.6 . what is the best point estimate for the mean gpa for all residents of the local apartment complex?
The best point estimate for the mean GPA for all residents of the local apartment complex would be 1.6.
Given, the mean GPA for the 127 residents of the local apartment complex is 1.6.
The mean or sample mean is used as a point estimate for the population mean or population parameter when the value of the mean of the sample is unbiased and accurately represents the mean of the population.
Here, we are given the mean GPA of 127 residents of the local apartment complex, which is 1.6.
Therefore, the best point estimate for the mean GPA for all residents of the local apartment complex would be 1.6.
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If the number of tolls collected varies directly as the number of vehicles and $129 was collected from 20 vehicles, how many vehicles result in the collection of $3225? Show how you arrived at your answer
Answer:
500 vehicles
Step-by-step explanation:
let t represent number of tolls and v represent number of vehicles.
given that t varies directly with v then the equation relating them is
t = kv ← k is the constant of variation
to find k use the condition t = 129 from v = 20 , then
129 = 20k ( divide both sides by 20 )
6.45 = k
t = 6.45v ← equation of variation
when t = 3225 , then
3225 = 6.45v ( divide both sides by 6.45 )
500 = v
the number of vehicles is 500
Write an equation for the function g whose graph is the graph f(t) = -100(1.05)^t translated to the right 5 units and up 50 units.
g(t) = -100 * [tex](1.05)^t[/tex] +[tex](1.05)^(-5)[/tex] 50 is equation for the function g whose graph is the graph f(t) = -100[tex](1.05)^t[/tex] translated to the right 5 units and up 50 units.
Starting with the function f(t) = -100[tex](1.05)^t[/tex], to translate it 5 units to the right and 50 units up, we can replace t with (t - 5) to shift it to the right, and add 50 to the whole function to shift it up. This gives us:
g(t) = f(t - 5) + 50
g(t) = -100[tex](1.05)^(t - 5)[/tex]+ 50
Simplifying this equation, we can use the properties of exponents to rewrite [tex](1.05)^(t - 5)[/tex] as [tex](1.05)^t[/tex] * [tex](1.05)^(-5)[/tex]:
g(t) = -100[tex](1.05)^t[/tex] *[tex](1.05)^(-5)[/tex]+ 50
g(t) = -100[tex](1.05)^(-5)[/tex] * [tex](1.05)^t[/tex] + 50
So the equation for the function g whose graph is the graph f(t) = -100[tex](1.05)^t[/tex] translated 5 units to the right and 50 units up is:
g(t) = -100[tex](1.05)^(-5)[/tex]* [tex](1.05)^t[/tex]+ 50
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Find the missing angle to the nearest degree.
Help explain how to solve
The value of the angle U in the triangle is 92.10 degrees.
How to find the angle in a triangle?The angle U in the triangle can be found using cosine rule as follows:
Let's use cosine formula to find the angle U
c² = a² + b² - 2ab cos C
Hence,
Therefore,
a = 58.8
b = 38.4
c = 71.4
Hence,
71.4² = 58.8² + 38.4² - 2(58.8)(38.4) cos U
5097.96 = 3457.44 + 1474.56 - 4515.84 cos U
5097.96 - 4932 = - 4515.84 cos U
165.96 = - 4515.84 cos U
divide both sides by - 4515.84
cos U = 165.96 / - 4515.84
cos U = - 0.03675063775
U = cos⁻¹ - 0.03675063775
U = 92.1032274244
Therefore,
U = 92.10 degrees
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which numbers in z84 are relatively prime to 84? enter your answer as a comma separated list of numbers.
The numbers in Z84 that are relatively prime to 84 are: 1, 5, 25, 29, 43, 47, 61, 65, 79, and 83.
To find the numbers in Z84 that are relatively prime to 84, we need to find the numbers that do not have any common factors with 84 other than 1.
First, we can factorize 84 as 2^2 * 3 * 7.
Next, we can remove all the factors of 2, 3, and 7 from the set Z84, since any number in Z84 that has any of these factors would have a common factor with 84 other than 1.
So, we are left with the set of numbers {1, 5, 25, 29, 43, 47, 61, 65, 79, 83}.
Therefore, the numbers in Z84 that are relatively prime to 84 are 1, 5, 25, 29, 43, 47, 61, 65, 79, and 83.
As a comma-separated list, the answer would be: 1, 5, 25, 29, 43, 47, 61, 65, 79, 83.
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In 1962, an automobile worker was paid an annual salary of $8,400. Each year the worker's pay went up by 5% of the previous year's salary. What is the total amount that the worker will have earned from the beginning of 1962 through the end of 1980?
the worker will have earned $231,584.10 from the period of beginning 1962 through the end 1980.
To solve this problem, we can use the formula for the sum of a geometric series:
S = a(1 - rⁿ)/(1 - r)
where S is the sum of the series, a is the first term, r is the common ratio, and n is the number of terms.
In this case, the first term is $8,400 and the common ratio is 1.05 (since the worker's salary increases by 5% each year). We need to find the sum of the series from 1962 to 1980, which is 19 years. So, the total amount that the worker will have earned from the beginning of 1962 through the end of 1980 is:
S = 8,400(1 - 1.05¹⁹)/(1 - 1.05)
S ≈ $231,584.10
Therefore, the worker will have earned approximately $231,584.10 during this period.
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You are offered a job that pays $34,000 during the first year, with an annual increase of 6% per year beginning in the second year. That is, beginning in year 2, your salary will be 1.06 times what it was in the previous year. What can you expect to earn in your fourth year on the job? Round your answer to the nearest dollar.
GIVING BRAINLIEST FOR THE CORRECT ANSWER (i need a proof that what you’re saying is right bc ppl are giving me the wrong answers)
Answer:
x [tex]\geq[/tex]2
Step-by-step explanation:
Since the arrow is pointing to the right, we know that it is greater than two. We also know that it could be equal to 2 because the dot is filled in on the number line. So, the answer is x is greater than or equal to 2.
a study indicates that the weights of adults are normally distributed with a mean of 140 lbs and a standard deviation of 25 lbs. what is the probability that a randomly selected adult weights between 120 and 165 lbs?
The probability that a randomly selected adult weighs between 120 and 165 lbs is approximately 0.8186.
Since the weights of adults are normally distributed with a mean of 140 lbs and a standard deviation of 25 lbs, we can use the standard normal distribution to calculate the probability.
We first need to standardize the values using the formula: z = (x - μ) / σ, where x is the weight, μ is the mean, and σ is the standard deviation.
For x = 120 lbs, z = (120 - 140) / 25 = -0.8, and for x = 165 lbs, z = (165 - 140) / 25 = 1.0. We can then use a calculator to find the probability between -0.8 and 1.0, which is approximately 0.8186.
Thus, the chance of picking an adult at random who weighs between 120 and 165 lbs is roughly 0.8186.
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If a regular polygon had 360 side, what would each exterior angle measure? What would each interior angle measure?
Therefore, each internal angle would be 178 degrees in a regular polygon with 360 sides.
what is angle ?In mathematics, an angle is a figure made up of two rays that share a shared endpoint and are referred to as the sides of the angle and the vertex of the angle, respectively. Angles are typically measured in degrees, radians, or other angle measurement units. Angles can be categorized based on how wide they are. An acute angle is one that is less than 90 degrees, an obtuse angle is one that is higher than 90 degrees but less than 180 degrees, and a right angle is one that is 90 degrees. A reflex angle is greater than 180 degrees but less than 360 degrees, and a straight angle is precisely 180 degrees.
given
Since a polygon with that many sides would have sides that are extremely tiny in relation to the radius, if a regular polygon has 360 sides, it is a circle. Since every group of points in a regular polygon has an equal exterior angle and the sum of all exterior angles in a circle is 360 degrees, each exterior angle in a regular polygon would be measured as follows:
360 edges / 360 degrees = one degree.
Each interior angle of a regular polygon with n sides can be determined using the following formula:
Inner angle is equal to (n-2) x 180 / n.
When we enter n = 360 into this algorithm, we obtain:
(360-2) x 180 degrees / 360 = 178 degrees is the interior angle.
Therefore, each internal angle would be 178 degrees in a regular polygon with 360 sides.
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Austin bought 1 pound of melon and 0.83 pounds of cherries. How much fruit did he buy in all?
Answer:
1.83 pounds of fruit in all
Step-by-step explanation:
1 pound of melon + 0.83 pounds of cherries = 1.83 pounds in all
Answer: He bought 1.83 pounds of fruit
Step-by-step explanation:
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