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Statistics help Weekly earrings of a student in one age group are normaly distributed w/ standard deviation of $90. Find the sample size needed to

Statistics help

Weekly earrings of a student in one age group are normaly distributed w/ standard deviation of $90. Find the sample size needed to assure w/ 95% confidence that the mean will not differ from population mean by more than $10. So 312 5 311 1

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