The average class size this semester in the business school of a particular university is 38.1 students with a standard deviation of 12.9 students. The z-score for a class with 21 students is ________.
A) -1.33
B) 0
C) 0.8
D) 1.51

Question

Quizplus · Accepted Answer

To find the z-score, we can use the formula: z = (x - μ) / σ
Where x is the class size, μ is the mean class size (38.1), and σ is the standard deviation (12.9).
z = (21 - 38.1) / 12.9 = -1.33
Therefore, the z-score for a class with 21 students is -1.33.

The Average Class Size This Semester in the Business School