A manufacturer of cream filled donuts wants to make sure that its automatic filling process is on target.Based on a sample of 25 donuts the mean weight of cream filling is estimated to be 15 grams with a standard deviation of 1.5 grams.However, the quality control inspectors wish to estimate the mean weight of cream filling more accurately so that they can be 99% confident that it is within 0.25 grams of the true mean.How many donuts should they sample?
A)150
B)543
C)212
D)410
E)239

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The Answer of A manufacturer of cream filled donuts wants to make sure that its automatic filling process is on target.Based on a sample of 25 donuts the mean weight of cream filling is estimated to be 15 grams with a standard deviation of 1.5 grams.However, the quality control inspectors wish to estimate the mean weight of cream filling more accurately so that they can be 99% confident that it is within 0.25 grams of the true mean.How many donuts should they sample?
A)150
B)543
C)212
D)410
E)239

A Manufacturer of Cream Filled Donuts Wants to Make Sure