Question

A researcher sends out 30 surveys. The probability a person returns the survey is 60%. If X is the number of surveys returned to the researcher, the standard deviation of X will be
A. 7.20
B. 2.68
C. 12

Answer 1

Answer:

B

Step-by-step explanation:

$\sqrt{30 * 0.6 * (1-0.6)}$ = 2.68