SOLUTION: Mary receives a score of 43 on her chemistry test. The teacher says Mary’s raw test score is equivalent to a z-score of 2.1. Compared to her classmates, how well did Mary do?

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Question 655395: Mary receives a score of 43 on her chemistry test. The teacher says Mary’s raw test score is equivalent to a z-score of 2.1. Compared to her classmates, how well did Mary do?
what's the standard deviation?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Mary receives a score of 43 on her chemistry test. The teacher says Mary’s raw test score is equivalent to a z-score of 2.1. Compared to her classmates, how well did Mary do?
what's the standard deviation?
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All you can say from that information is that Mary's 43 is 2.1 standard
deviations above the mean. She did better than normalcdf(-100,2.1) = 98%
of the class.
The information given does not reveal the size of the standard deviation.
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Cheers,
Stan H.