The Amount Filled by a Certain Bottling Machine,x,is Approximately Normally

Question 47
Multiple Choice

The amount filled by a certain bottling machine,X,is approximately normally distributed with unknown mean,μ,and standard deviation,σ =1.What is the minimum sample size,n,so that there is a probability of (at least)0.9 that the sample mean will be within 0.2 ounces of the population mean? A)16 B)28 C)54 D)68 E)125