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drek231 [11]
3 years ago
13

99 POINTS!

Mathematics
2 answers:
laila [671]3 years ago
6 0

Standard deviation = √(n * p * q)

You are given n and p

q = 1 - p

q = 1 -0.2 = 0.8

Standard deviation = √(21 * 0.2 * 0.8)

=√3.36 = 1.83

The answer is A.

Andrews [41]3 years ago
5 0

The standard deviation for a given binomial distribution n and p would be the following:

\sigma=\sqrt{n \times p \times q}

The variable q is equivalent to (p-1)

=\sqrt{n\times p\times(p-1)}

Substitute the values of p and n into the equation

=\sqrt{21\times0.2\times(1-0.2)}

=\sqrt{21\times0.2\times0.8}

Use a calculator to solve for this square root since it would be too hard and complicated to do by hand

=1.83303027798...

Round this to the nearest hundredths place since all answer choices are rounded like that

=1.83

Thus, the answer is choice A. Let me know if you need any clarifications, thanks!

~ Padoru

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the answer was 9 (red)

Step-by-step explanation:

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PLEASE HELP ANSWER THIS QUESTION I DON'T KNOW IT AT ALL
Lena [83]

<h2><u>PLEASE MARK BRAINLIEST!</u></h2>

Answer:

  1. Is y = 4x - 7 a linear function?
  2. Is y = 6x² - 1 a linear function?
  3. Is y = \frac{1}{2x} + 10 a linear function?

Step-by-step explanation:

  1. Yes it is - when you graph this equation, it results in a [straight] line, signalling that it is a linear function.
  2. No it's not - when you graph this equation, it results in a v- kinda shape on the graph. Linear functions are [straight] lines on a graph, and this line wasn't straight. In fact, this wasn't even a line.
  3. No it's not - when you graph this equation, it results in a bend at the origin. The line on the graph is not straight, so this is not a linear equation.

For the graphs -

  • The first one represents the linear function [y = 4x - 7]
  • The second one (that looks like an L) represents the last not linear function [y = \frac{1}{2x} + 10]
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6 0
2 years ago
Find the area of the following shape.
ad-work [718]

Answer:

57 units^2

Step-by-step explanation:

First find the area of the triangle on the left

ABC

It has a base AC which is  9 units and a height of 3 units

A = 1/2 bh = 1/2 ( 9) *3 = 27/2 = 13.5

Then find the area of the triangle on the right

DE

It has a base AC which is  6 units and a height of 1 units

A = 1/2 bh = 1/2 ( 6) *1  = 3

Then find the area of the triangle on the top

It has a base AC which is  3 units and a height of 3 units

A = 1/2 bh = 1/2 ( 3) *3  = 9/2 = 4.5

Then find the area of the rectangular region

A = lw = 6*6 = 36

Add them together

13.5+3+4.5+36 =57 units^2

5 0
2 years ago
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lorasvet [3.4K]
Answer: X=100
Good luck
8 0
3 years ago
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