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Could you help answer this with calculations shown? A professor is trying to find the average exam grade in his class. The sample mean should

Could you help answer this with calculations shown?

A professor is trying to find the average exam grade in his class. The sample mean should be within 5 points of the mean exam grade. The standard deviation is 12. What is the sample size necessary for a 90% confidence level? 0 4 O 15.5 O 16 O 3.95

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