Bob's Sample of Freshman GPAs Showed a Mean of 2

question 136

Essay

Bob's sample of freshman GPAs showed a mean of 2.72 with a standard deviation of 0.31. (a) What range would you predict for all the grades? For the middle 95 percent? Explain. (b) Why might your estimates be inaccurate?
E.R. is based on the normal distribution, so could be inaccurate if grades are skewed.

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