A student scored 89 points on a test where the mean score was 83 and the standard deviation was 3. The student's z-score was
A) 27.67
B) 29.67
C) 0.67
D) 2.00

Question

Quizplus · Accepted Answer

The formula of z-score is:

z = (x - μ) / σ

where 
x = student's score
μ = mean score
σ = standard deviation

Substituting the given values:

z = (89 - 83) / 3
z = 2.00

Therefore, the student's z-score is 2.00.

A Student Scored 89 Points on a Test Where the Mean