A Quality Analyst Wants to Construct a Sample Mean Chart

Multiple Choice

A Quality Analyst wants to construct a sample mean chart for controlling a packaging process.He knows from past experience that whenever this process is under control,package weight is normally distributed with a mean of twenty ounces and a standard deviation of two ounces.Each day last week,he randomly selected four packages and weighed each with the following results: What value should be used as the mean of the sampling distribution of sample means?

A) 19 ounces
B) 20 ounces
C) 20.6 ounces
D) 21 ounces
E) 23 ounces