Question

The average class size this semester in the business school of a particular university is 16 students with a standard deviation of 3.9 students. The z-score for a class with 21 students is ________.

Answer 1

1.28

Explanation:

We are given;

Population mean; μ = 16

Population standard deviation; σ = 3.9

Sample mean; x' = 21

Formula for z-score is;

z = (x' - μ)/σ

z = (21 - 16)/3.9

z = 1.28