in the counting letters examples, the dictionary used to keep track of letter frequencies uses the count as the key. true false

Answer:

The standard deviation for the number of people with the genetic mutation in groups of 900 is approximately 6.54.

Step-by-step explanation:

To find the standard deviation for the number of people with the genetic mutation in groups of 900, we can use the properties of the binomial distribution. The binomial distribution describes the number of successes (in this case, people with the genetic mutation) in a fixed number of independent Bernoulli trials (in this case, selecting people), each with the same probability of success.

In our case, we have:

n = 900 (number of trials, i.e., the number of people in each group)

p = 0.05 (probability of success, i.e., the probability of having the genetic mutation)

The mean (μ) and variance (σ²) of a binomial distribution can be calculated using the formulas:

μ = n * p

σ² = n * p * (1 - p)

We are interested in finding the standard deviation (σ), which is the square root of the variance:

σ = sqrt(σ²)

So, in our case:

σ = sqrt(900 * 0.05 * (1 - 0.05))

σ = sqrt(900 * 0.05 * 0.95)

σ ≈ sqrt(42.75)

σ ≈ 6.54

Thus, the standard deviation for the number of people with the genetic mutation in groups of 900 is approximately 6.54.

The standard deviation for the number of people with the genetic mutation in such groups of 900 is approximately 6.48.

To find the standard deviation for the number of people with the genetic mutation in groups of 900, you can use the formula for the standard deviation of a binomial distribution:

σ = √(n * p * (1-p))

Here, n = 900 (number of people randomly selected), p = 0.05 (5% of the population has the genetic mutation).

σ = √(900 * 0.05 * (1 - 0.05))
σ = √(45 * 0.95)
σ ≈ 6.48

The standard deviation for the number of people with the genetic mutation in such groups of 900 is approximately 6.48.

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The sample size necessary such that the margin of error of the estimate for a 90% confidence interval for the mean age of all residents is at most 3.4 years is 59.56.

An estimated range for an unknown parameter is known as a confidence interval. The 95% confidence level is the most popular, however other levels, such as 90% or 99%, are occasionally used when computing confidence intervals.

Given: A city official would like to estimate the mean age of all residents of Stuart. The standard deviation of the ages of all residents of Stuart is known to be 16 years.

σ = 16 ..Population SD

The margin of error, E = 3.4

c = 90% = 0.90 ...confidence level

a = 1 - c = 1 - 0.90 = 0.1

a/2 = 0.1/2 = 0.05

Using the Z table,

z = 1.64

Now, sample size (n) is given by,

(za/E)²

(1.64×16/3.4)² = 59.56

Hence, the sample size necessary such that the margin of error of the estimate for a 90% confidence interval for the mean age of all residents is at most 3.4 years is 59.56.

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Sascha receives 3.65% more percentage yield from the corporate bond than from dividends.

What is percentage yield?

To find out how much more percentage yield Sascha receives from the corporate bond than from dividends, we need to calculate the yield for each investment and compare them.

For the corporate bond:

Annual interest = 8.07% of $8,706 = $703.24

Yield = Annual interest / Bond value = $703.24 / $8,706 = 0.0809 or 8.09%

For the stock:

Dividend yield = Annual dividend / Stock value = $2 / $45 = 0.0444 or 4.44%

To find out the difference in percentage yield, we subtract the dividend yield from the bond yield:

8.09% - 4.44% = 3.65%

Therefore, Sascha receives 3.65% more percentage yield from the corporate bond than from dividends.

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Answer:

(v - 6)(-5v + 1)

Step-by-step explanation:

[tex] - 5 {v}^{2} + 31v - 6[/tex]

[tex] - 5 {v}^{2} + 30v +v - 6[/tex]

[tex] - 5v(v - 6) +(v - 6)[/tex]

[tex] (v - 6)( - 5v + 1)[/tex]

Answer:

Step-by-step explanation:

The required common solutions of the given equations are x=-1 and x=3.

To find the common solution of the given equations graphically, we need to graph both f(x) and g(x) on the same coordinate plane and find the x-value(s) where the graphs intersect.

To graph f(x)=-x+5, we can start by plotting the y-intercept at (0,5), and then draw a straight line that goes down 1 unit for every 1 unit we move to the right.

To graph g(x)=x²-3x+2, we can start by finding the x-intercepts, which are the points where the graph crosses the x-axis. We can do this by factoring the quadratic equation: x²-3x+2=(x-1)(x-2). This gives us two x-intercepts at (1,0) and (2,0). We can also find the vertex of the parabola, which is at x=3/2. The graph of g(x) is a parabola that opens upwards, with its minimum point at (3/2,-1/4).

From the graph, we can see that the two functions intersect at two points, which are (-1, 6) and (3, 2).

Therefore, the common solutions of the given equations are x=-1 and x=3.

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The area of the shaded region is 170.88 sq. cm.

A circle with a radius of 6 cm is inside a circle with a radius of 9.5 cm.

The area of a circle is given by the formula:

A = πr²Where,A = Areaπ = 3.14r = radius

For the shaded area, we need to subtract the area of the smaller circle from the larger circle.

the radius of the larger circle is 9.5 cm and the radius of the smaller circle is 6 cm.

So, the area of the shaded area can be given as:

Area of the shaded region = Area of larger circle - Area of smaller circle

Area of larger circle = πr²= π(9.5)²= π(90.25) sq. cm.= 283.92 sq. cm.

Area of smaller circle = πr²= π(6)²= π(36) sq. cm.= 113.04 sq. cm.

So, the area of the shaded region is:

Area of the shaded region = 283.92 - 113.04= 170.88 sq. cm.

Therefore, the area of the shaded region is 170.88 sq. cm.

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Question

A circle with radius of 6 cm sits inside a circle with radius of 9 cm.

What is the area of the shaded region?

Round your final answer to the nearest hundredth.

A circle with radius of 6 cm sits inside a - 1

The general equation for the circle that would pass through the given points would be x^2 + y^2 + x + (7/12)y - 315/576 = 0.

To find the general equation of the circle that passes through the points (-5, 0), (0, 4), and (2, 4), we can use the following equation for a circle:

(x - h)^2 + (y - k)^2 = r^2

Express the equation in terms of x, y, h, k, and r:

(x^2 - 2hx + h^2) + (y^2 - 2ky + k^2) = r^2

x^2 + y^2 - 2hx - 2ky + (h^2 + k^2 - r^2) = 0

Plug in the coordinates of the three points:

(-5)^2 + 0^2 - 2h(-5) - 2k(0) + (h^2 + k^2 - r^2) = 0

0^2 + 4^2 - 2h(0) - 2k(4) + (h^2 + k^2 - r^2) = 0

2^2 + 4^2 - 2h(2) - 2k(4) + (h^2 + k^2 - r^2) = 0

Substitute the values of h, k, and r^2:

(x - (-1/2))^2 + (y - (-7/24))^2 = 585/64

(x + 1/2)^2 + (y + 7/24)^2 = 585/64

(x^2 + x + 1/4) + (y^2 + (7/12)y + 49/576) = 585/64

x^2 + y^2 + x + (7/12)y + (1/4 + 49/576 - 585/64) = 0

x^2 + y^2 + x + (7/12)y - 315/576 = 0

The general equation for the circle that passes through the points (-5, 0), (0, 4), and (2, 4) is:

x^2 + y^2 + x + (7/12)y - 315/576 = 0

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The exponential function shown in the table has the equation y = 3 * 4x.

The general form of an exponential function is y = [tex]ab^x[/tex], where "a" is the initial value of y when x = 0 and "b" is the common ratio.

Using the given table, we can find "a" by looking at the value of y when x = 0, which is 3. So, a = 3.

To find "b", we can use the ratio of consecutive outputs:

b = y2 / y1 = 48 / 12 = 4

We can verify this ratio by also checking the ratio of y3 to y2:

b = y3 / y2 = 192 / 48 = 4

Therefore, the equation of the exponential function represented by the table is:

y = 3 * 4^x

where x is the input (the value of x in the table) and y is the output (the corresponding value of y in the table).

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Answer:

[tex]x∈[4; + ∞)[/tex]

Step-by-step explanation:

[tex]x + 10 \geqslant 14[/tex]

Make x the subject (also, when moving terms to the other side, make sure to change their signs into the opposite of the previous one):

[tex]x \geqslant 14 - 10[/tex]

[tex]x \geqslant 4[/tex]

[tex]x∈[4; + ∞)[/tex]

I also added a photo of my graph

Answer:x ≥+4

Step-by-step explanation:

Remember in an earlier lesson, you learned about taking x by it's self.

You're doing the same thing here.  

(-10)  x+14 ≥ 14    (-10)

x≥ +4

Then you a dot on the +4 spot your line. and since this is an equal greater sign, you fill in the dot. Lastly you draw the arrow as it's been shown.

Answer:

The volume of the toy box is

60 × 24 × 30 = 43,200 cubic inches

12 inches = 1 foot, so

(12^3) cubic inches = 1,728 cubic inches =

1 cubic foot

43,200 cubic inches = 25 cubic feet

As new evidence emerges, scientific theories are continually refined, revised, or even replaced. This ongoing process is essential to the advancement of scientific knowledge and understanding.

A series of testable hypotheses that are linked up in a coherent manner in order to explain a body of material evidence is called a scientific theory. A scientific theory is a well-substantiated explanation of a particular aspect of the natural world, based on empirical evidence and rigorous testing.

Here is a step-by-step explanation of how a scientific theory is developed:

1. Observation: Scientists observe a natural phenomenon or pattern in the world, gathering data and evidence.

2. Question: Based on the observations, scientists develop a research question to explore the phenomenon further.

3. Hypothesis: A hypothesis is a testable prediction or explanation for the observed phenomenon, derived from existing knowledge or understanding.

4. Experimentation: Scientists design and conduct experiments to test the hypotheses, collecting data and analyzing the results to determine if the hypothesis is supported or refuted.

5. Data Analysis: The data collected from the experiments is carefully analyzed, and any patterns or trends are identified.

6. Conclusion: Based on the data analysis, scientists draw conclusions about the validity of the hypothesis. If the hypothesis is supported, it can be incorporated into a broader scientific theory.

7. Peer Review: The scientific findings are shared with the broader scientific community, and other researchers independently review and assess the work to ensure its validity.

8. Replication: Other scientists attempt to replicate the experiments and findings to confirm the accuracy of the results.

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Therefore, the polar form of the rectangular equation x = y² is: r = √(cos(θ) / sin²(θ))

In mathematics, an equation is a statement that shows the equality between two expressions. An equation typically contains variables, constants, and mathematical operations such as addition, subtraction, multiplication, and division. The expressions on either side of the equal sign are called the left-hand side (LHS) and the right-hand side (RHS) of the equation.

Here,

To convert the rectangular equation x = y² to polar form, we need to replace x and y with their polar representations in terms of r and theta. Here's how to do it:

x = y²

r cos(θ) = (r sin(θ))² [replace x and y with r cos(θ) and r sin(θ)]

r cos(θ) = r² sin²(θ)

r² sin²(θ) - r cos(θ) = 0

r(r sin(θ))² = r cos(θ)

r² = cos(θ) / sin²(θ)

r = √(cos(θ) / sin²(θ))

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The height of the basketball hoop is 13.32'.

What is law of similarity?

The Law of Similarity in mathematics states that if two geometric figures have the same shape but different sizes, then they are considered similar. This means that the corresponding angles of the two figures are congruent, and the corresponding sides are proportional in length.

Formally, if we have two geometric figures A and B, and if every angle of figure A is congruent to the corresponding angle of figure B, and if the ratio of the length of any pair of corresponding sides of A and B is constant, then we can say that A and B are similar figures.

Here we can see two triangle and base of two triangle is given.

Here base of small triangle is 12' and the base of big triangle is [tex](12'+25') = 37[/tex]

It is also given that height of small triangle is 4'3.84".

Now we want to find the height of the basketball hoop which is equal to height of big triangle.

Let the height of the basketball hoop be x.

So, by law of similarity ratios,[tex] \frac{12'}{37'} = \frac {4'3.84''}{x}[/tex]

Now, [tex]4'3.84''= 4.32'[/tex]

So, 12'/37' = 4.32'/x

Therefore, [tex]x = 13.32'[/tex]

Therefore, the height of the basketball hoop is 13.32'.

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Answer: GRAPHED

Step-by-step explanation:

1. question

To find the total surface area of the box, we need to find the areas of all six faces and then add them up. Let's call the length, width, and height of the rectangular prism l, w, and h, respectively. Then the surface areas of the six faces are:

Top and bottom faces: 2lw (there are two identical faces)

Front and back faces: 2lh (again, two identical faces)

Left and right faces: 2wh (and two identical faces here as well)

So the total surface area is:

2lw + 2lh + 2wh

Substituting the given dimensions of the Freebie Cereal box, we have:

2(10)(8) + 2(10)(12) + 2(8)(12)

= 160 + 240 + 192

= 592

Therefore, the total surface area of the Freebie Cereal box is 592 square inches.

2.question

The lateral surface area of a rectangular prism is the sum of the areas of all its faces except for the top and bottom faces. In this case, the sandbox has dimensions of 4.5 feet by 5.4 feet by 2 feet.

The area of the front and back faces is 2 x 2 x 5.4 = 21.6 square feet.

The area of the left and right faces is 2 x 2 x 4.5 = 18 square feet.

So the total lateral surface area is 21.6 + 18 = 39.6 square feet.

Therefore, the closest answer to the lateral surface area of the sandbox is 39.6.

In terms οf area οf circle the radius οf the circle becοmes, r = √(A/π)

In Mathematics  a circle is a special kind οf ellipse. In this particular kind οf ellipse the eccentricity is zerο and the twο fοci are cοincident. A circle is alsο stated as the lοcus οf the pοints which drawn at an equidistant frοm the center and the distance frοm the center οf the circle tο the οuter line(circumference) is the radius οf the circle.

The area οf a circle is given by A= π r² where r is the radius οf the circle and π= 3.14

Frοm the given equatiοn we have tο determine the value οf r that is the radius οf the circle.

A= π r²

Dividing by π tο the bοth sides οf the equatiοn we get,

⇒A/π = r²

⇒ r² = A/π [ Reversing bοth sides ]

Taking square rοοt tο the bοth sides οf equatiοn we get,

⇒ r= ±√(A/π)

Nοw radius οf a circle cannοt be negative sο the negative value will be neglected.

Hence, in terms οf area οf circle the radius οf the circle becοmes

r= √(A/π)

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Answer: To solve the equation Three-fifths (30 x - 15) = 72, we can start by simplifying the left side of the equation by distributing the coefficient 3/5 to the terms inside the parenthesis:

Three-fifths (30 x - 15) = 72

18x - 9 = 72 (dividing both sides by 3/5)

Multiplying both sides of the equation by 5/3, we get:

10x - 5 = 24

10x = 29

x = 2.9

So the value of x for the original equation is x = 2.9.

Now we can test each option to see which equations have the same value of x:

18x - 15 = 72

18(2.9) - 15 = 40.2

This equation does not have the same value of x as the original equation.

50x - 25 = 72

50(2.9) - 25 = 125

This equation does not have the same value of x as the original equation.

18x - 9 = 72

18(2.9) - 9 = 40.2

This equation does not have the same value of x as the original equation.

3(6x - 3) = 72

3(6(2.9) - 3) = 72

This equation has the same value of x as the original equation.

x = 4.5

This equation does not have the same value of x as the original equation.

Therefore, the equations that have the same value of x as the original equation are:

3(6x - 3) = 72

x = 2.9

Step-by-step explanation:

Answer:

X= -3

Step-by-step explanation:

The equation of the line parallel to y-axis and passing through (-3, 3) is

x = -3

What is equation?

An equation is a mathematical statement that shows that two mathematical expressions are equal.

Given that, a line passing through (-3,3), parallel to the y-axis,

The slope intercept form is given by,

y = mx+c

Where, m is the slope and c is the y intercept.

When any parallel to x or y-axis, its slope is zero,

Therefore,

3 = 0x-3+c

c = 3

Therefore, y = 3

The question is asking for line parallel to x-axis and passing through (-3, 3)

Hence, the required equation is x = -3

we can only see a portion of the graph of this function in the standard viewing window of -10 to 10.

What is Graph ?

In mathematics, a graph is a visual representation of a set of objects, such as numbers or data points, and the relationships between them. Graphs can be used to represent a variety of mathematical concepts, including functions, sets of data, and geometric shapes.

The function f(x) = -|x| - 12 is a piecewise function. When x is greater than or equal to zero, the function simplifies to f(x) = -x - 12, and when x is less than zero, it simplifies to f(x) = x - 12.

If we graph both of these pieces separately, we get two straight lines that intersect at the point (0, -12), where the absolute value of x changes sign. The slope of both lines is -1, which means they are both downward sloping with a negative slope.

When we graph this function in the standard viewing window of -10 to 10, we can see the part of the graph where x is greater than or equal to zero, which is the left side of the graph, but the part where x is less than zero, which is the right side of the graph, is outside the viewing window.

Therefore, we can only see a portion of the graph of this function in the standard viewing window of -10 to 10.

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The circumference of the circle is approximately 69.115 kilometers.

What is circle ?

A circle is a closed two-dimensional shape where all points on the edge are equidistant from the center point. It can be defined as the set of all points in a plane that are at a given distance, called the radius, from a given point, called the center.

The circumference of a circle can be calculated using the formula:

C = 2πr

where r is the radius of the circle and π is the mathematical constant pi (approximately equal to 3.14159).

Substituting r = 11 kilometers into the formula, we get:

C = 2π(11) ≈ 69.115 kilometers

Therefore, the circumference of the circle is approximately 69.115 kilometers.

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The probability that there are at least 10 neutrophils in a field of 50 bone marrow cells, given that the probability of a single bone marrow cell being a neutrophil is 0.2, is approximately 0.034.

In this problem, we are given that the number of neutrophils in a field of 50 bone marrow cells follows a binomial distribution with a probability of success, i.e., the probability of a single bone marrow cell being a neutrophil, p=0.2. We need to find the probability that there are at least 10 neutrophils in the field.

To solve this problem, we can use the cumulative distribution function (CDF) of the binomial distribution. The CDF gives the probability of getting up to a certain number of successes in a given number of trials.

Using a binomial distribution calculator or a statistical software package, we can find that the probability of getting 10 or more neutrophils in the field is approximately 0.034. Therefore, the probability that there are at least 10 neutrophils in the field is 0.034.

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Question: In a laboratory biopsy, a field of 50 bone marrow cells is observed under a microscope. A special dye is inserted, which only the neutrophils absorb. Then, the number r of neutrophils in the field is counted. What is the probability that there are at least 10 neutrophils in the field if the probability of a single bone marrow cell being a neutrophil is 0.2? Assume that the number of neutrophils in the field follows a binomial distribution.

Answer:48%

Step-by-step explanation:

have a good day

The surface area that can be painted with one complete rotation of the roller is 1508 inches².

Surface area is defined as the total amount of area that covers the surface or outside of a three-dimensional figure.

A paint roller is in the shape of a cylinder. To determine the surface area that can be painted with one complete rotation of the roller, solve for the surface area of a cylinder without the circular bases.

SA = 2πrh

where SA = surface area

r = radius of the base = 8 inches

h = height of the cylinder = width = 30 inches

Plug in the values and solve for the surface area.

SA = 2πrh

SA = 2π(8*30)

SA = 150.7.966 = 1508 inches²

Hence, the surface area that can be painted with one complete rotation of the roller is 1508inches².

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Answer: 60 %

Step-by-step explanation:

To find what percent 144 is of 240, we can use the following proportion:

part/whole = percent/100

Let x be the percentage we are trying to find, then we can write:

144/240 = x/100

To solve for x, we can cross-multiply:

14400 = 240x

Dividing both sides by 240, we get:

x = 14400/240 = 60

Therefore, 144 is 60% of 240.

Answer:

60%

Step-by-step explanation:

Percent proportion:

240 - 100%

144 - x%

Cross-multiply to find x:

[tex] \frac{144 \times 100\%}{240} = \frac{14400}{240} = 60\%[/tex]

So, 144 is 60% of 240

Using expression 2x - 1,876.23 = 1,692.45, each of Ivy's paychecks is approximately $1,784.34.

What exactly are expressions?

In mathematics, an expression is a combination of symbols and/or numbers that represents a value or a set of values. Expressions can contain variables, constants, operations, and functions, and can be combined using mathematical operators such as addition, subtraction, multiplication, division, and exponentiation.

Now,

Let's assume that Ivy's paychecks are of equal amounts, and each paycheck is of amount "x".

According to the problem, Ivy received two paychecks and withdrew a total of $1,876.23 from her account. Therefore, we can set up the following equation:

2x - 1,876.23 = 1,692.45

Solving for x, we can simplify the equation as follows:

2x = 1,692.45 + 1,876.23

2x = 3,568.68

x = 3,568.68 / 2

x ≈ 1,784.34

Therefore, each of Ivy's paychecks is approximately $1,784.34.

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The value of B in continuous variable is 1/333.

Suppose x is a continuous variable with the probability density function f(x) = { B(10 - x)^2 for 0 < x < 10, and 0 otherwise.

To find the value of B, we need to use the fact that the total probability must equal to 1. In other words, we need to integrate the probability density function f(x) over the given interval and set it equal to 1:

∫[0,10] B(10 - x)^2 dx = 1

First, let's perform the integration:
∫(10 - x)^2 dx = [(-1/3)(10 - x)^3] + C
Now, apply the limits of integration:

[-(1/3)(10 - 10)^3] - [(-1/3)(10 - 0)^3] = 1
0 - [(-1/3)(10^3)] = 1
(1/3)(1000) = 1

Now, solve for B:
B = 3/1000 = 1/333
So, the value of B is 1/333.

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The equation for the line of best fit is a useful tool in data analysis to describe the relationship between two Variables and make predictions based on that relationship.

The equation for the line of best fit is a mathematical formula that describes the relationship between two variables in a data set. It is used in regression analysis to estimate and predict the value of one variable based on the value of another.

To find the equation for the line of best fit, we use the method of least squares, which minimizes the sum of the squares of the differences between the observed data points and the predicted values from the equation.

The equation takes the form of y = mx + b, where y is the dependent variable, x is the independent variable, m is the slope of the line, and b is the y-intercept. The slope represents the rate of change of y with respect to x, and the y-intercept is the value of y when x = 0.

The coefficient of determination, denoted as r, is a measure of how well the line fits the data. It ranges from -1 to 1, where a value of 1 indicates a perfect fit, and a value of 0 indicates no correlation. A negative value indicates an inverse relationship.

In summary, the equation for the line of best fit is a useful tool in data analysis to describe the relationship between two variables and make predictions based on that relationship.

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Answer: A and C

Step-by-step explanation: It’s not independent or dependent because,

independent= doesn’t depend on another (cause)

dependent= depends on another (effect) —> maybe if this were about weight gain/ weight loss.

I would go with

C and A.

It makes the most sense food wise.