99 points!
find the standard deviation for the binomial distribution.

n=21; p=0.2

a) 1.83
b) 5.95
c) -0.58
d) 5.10

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.

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

The variable is equivalent to

Substitute the values of and into the equation

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

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

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

~ Padoru

in simplified version   it would be x ≤-4

step-by-step explanation:

multiply each term in x ≤-4 by -1