How many nickels need to weigh to get average accurate

Reference no: EM13142206

A study of nickels showed that the standard deviation of the weight of nickels is 300 milligrams. A coin counter manufacturer wishes to find the 90% confidence interval for the average weight of a nickel. How many nickels does he need to weigh to obtain an average accurate to within 10 milligrams?

Reference no: EM13142206

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