The probability that an individual is left-handed is 0.16. In a class of 80 students, what is the mean and standard deviation of the number of left-handed students? Round to the nearest hundredth when necessary.
A) mean: 12.8; standard deviation: 3.28
B) mean: 80; standard deviation: 3.28
C) mean: 12.8; standard deviation: 3.58
D) mean: 80; standard deviation: 3.58

Question

Quizplus · Accepted Answer

The mean is calculated as np = 80 * 0.16 = 12.8. The standard deviation is calculated as sqrt(np(1-p)) = sqrt(80 * 0.16 * 0.84) = 3.28.

The Probability That an Individual Is Left-Handed Is 0