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: If he uses upper and lower control limits of 23 and 17 ounces,on what day(s) ,if any,does this process appear to be out of control?

A) Monday
B) Tuesday
C) Monday and Tuesday
D) Monday,Tuesday,and Thursday
E) The process is in control