Asked by James Jones
On a recent math exam, Alex received a score of 92%. His z-score is positive 2. If the mean for the exam is 84, what is the standard deviation?
Answers
Answered by
PsyDAG
You indicate Alex's score as a percentage, but the mean as a raw score. I will assume that the "%" is a typo.
Z = (score-mean)/SD
2 = (92-84)/SD
Solve for SD.
Z = (score-mean)/SD
2 = (92-84)/SD
Solve for SD.
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