How many nickels does coin counter manufacturer need weigh

Reference no: EM13135662

A previous study of nickels showed that the standard deviation of the weight of nickels is 150 milligrams. How many nickels does a coin counter manufacturer need to weigh so that she can be 98% confident that her sample mean is within 25 milligrams of the true average weight of a nickel?

Reference no: EM13135662

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