Statistics And Probability

Question

About 1% of the population has a particular genetic mutation. 900 people are randomly selected.

Find the standard deviation for the number of people with the genetic mutation in such groups of 900. (If possible, round to 1 decimal place.)

Answer 1

Proportion of people with a certain genetic mutation is a binomial random variable.

The standard deviation of a binomial random variable is

Square Root of (n*p*(1-p)) = sqrt(900*.01*.99) = 3.0