Scores on a test have a mean of 66 and a standard deviation of 9. Michelle has a score of 57. Convert Michelle's score to a z score.
A) 9
B) -1
C) 1
D) -9

Name: Scores on a test have a mean of 66 and a standard deviation of 9. Michelle has a score of 57. Convert Michelle's score to a z score. A) 9 B) -1 C) 1 D) -9
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Quizplus · Accepted Answer

The z score is calculated by subtracting the mean from the individual score and then dividing by the standard deviation: $z = \frac{(57 - 66)}{9} = -1$.

Scores on a Test Have a Mean of 66 and a Standard