Standard deviation

Question

About 2 % of the population has a particular genetic mutation. 100 people are randomly selected. Find the standard deviation for the number of people with the genetic mutation in such groups of 100

Answer 1

For situations where we're looking at the proportion of a sample or population, the standard deviation equation is σ=√[np(1-p)], where n is the sample size and p is the proportion in decimal notation. I would say multiply together the sample size, the proportion, and "1-p". Then take the square root of that answer.

Keep in mind that I had it as np(1-p); keep the order of operations in mind here or you will get the wrong answer.