Solve the problem.
-Scores on a test have a mean of 69 and a standard deviation of 11. Michelle has a score of 80. Convert Michelle's score to a z-score.
A)-11
B)-1
C)1
D)11

Question

Solve the problem.
-Scores on a test have a mean of 69 and a standard deviation of 11. Michelle has a score of 80. Convert Michelle's score to a z-score. 
A)-11
B)-1
C)1
D)11

Quizplus · Accepted Answer

The z-score is calculated by subtracting the mean from the individual score and then dividing by the standard deviation: $z = \frac{(X - \mu)}{\sigma}$. For Michelle, $z = \frac{(80 - 69)}{11} = 1$.

Solve the Problem. -Scores on a Test Have a Mean of 69 and of 69