Question: What (smallest ) sample size would you need to estimate an unknown population mean / to within 4 units with 95% confidence, in a population

What (smallest ) sample size would you need to estimate an

unknown population mean / to within 4 units with 95% confidence, in

What (smallest ) sample size would you need to estimate an unknown population mean / to within 4 units with 95% confidence, in a population where O = 15 ? O 102 O 54 O 55 O. 94

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