A Manufacturer of Cheese Filled Ravioli Wants to Make Sure

Multiple Choice

A manufacturer of cheese filled ravioli wants to make sure that its automatic filling process is on target.Based on a sample of 25 ravioli the mean weight of cheese 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 cheese filling more accurately so
That they can be 99% confident that it is within .25 grams of the true mean.How many
Ravioli should they sample?

A) 150
B) 543
C) 212
D) 410
E) 239