SOLUTION: A university test was given where the scores are normally distributed. A student had a score of 61% which was 2.45 standard deviations from the mean. If the mean of the exam scor

Question 25143: A university test was given where the scores are normally distributed. A student had a score of 61% which was 2.45 standard deviations from the mean. If the mean of the exam scores was 54%, then what was the standard deviation of the exam scores?
And I would like to say thank you to everybody who answered all my problems in the past and to the person who solves this question.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Use the "z" formula:
z(x)=(x-mu)/sigma
2.45 = (0.61-0.54)/sigma
sigma = (0.07)/2.45 = 0.02857...
Cheers,
Stan H.

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