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# Standard Deviation and Mean : Appication Word Problem - Phony Data?

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For any data set of n values with standard deviation s, every value must be within s âˆšn - 1 of the mean. A statistics teacher reports that the test scores in her class of 17 students had a mean of 75.0 and a standard deviation of 5.0. Kelly, the class's self-proclaimed best student, claims that she received a grade of 97. Could Kelly be telling the truth?

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Phony data? For any data set of n values with standard deviation s, every value must be within s âˆšn - 1 of the mean. A statistics teacher reports that the test scores in her ...

#### Solution Summary

Mean and standard deviation are applied to the validity of data. The solution is detailed and well presented.

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