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StatisticsQ&A Librarya study of nickels showed that the standard deviation of the weight of nickels is 150 milligrams. a coin counter manufacterer wishes to find the 95% confidence interval for the average weight of a nickel. how many nickels does he need to weigh to obtain an average accurate to within 20 milligramsQuestion

a study of nickels showed that the standard deviation of the weight of nickels is 150 milligrams. a coin counter manufacterer wishes to find the 95% confidence interval for the average weight of a nickel. how many nickels does he need to weigh to obtain an average accurate to within 20 milligrams

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