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a medical researcher proposed to estimate the mean serum cholesterol level of a certain population of...

a medical researcher proposed to estimate the mean serum cholesterol level of a certain population of middle aged men. based on tbe random sample of the population. if he wants to be 90% confident that his estimation is wothin 2mg/dl of the true value of the population mean, how large a sample does the researcher need to take if he also knows that the population standard deviation is about 54mg/dl ?

a.1195
b.52
c.37
d.1972
e.1973
Math   Statistics-And-Probability   
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