A teacher records the test scores for the 30 students in her class. The standard deviation of the scores was 10. Corresponding to each score, she calculates a z-score. Hugh's test score was one and A half standard deviations below the mean. What would his z-score have been?
A)15
B)-15
C)1.5
D)-1.5

Question

A teacher records the test scores for the 30 students in her class. The standard deviation of the scores was 10. Corresponding to each score, she calculates a z-score. Hugh's test score was one and A half standard deviations below the mean. What would his z-score have been? 
A)15
B)-15
C)1.5
D)-1.5

Quizplus · Accepted Answer

The z-score is calculated as the number of standard deviations a data point is from the mean. Since Hugh's score was 1.5 standard deviations below the mean, his z-score would be -1.5.

A Teacher Records the Test Scores for the 30 Students