A quality analyst wants to construct a sample mean chart for controlling a packaging process. He knows from past experience that the process standard deviation is two ounces. Each day last week, he randomly selected four packages and weighed each. The data from that activity appear below.

	Weight
Day	Package 1	Package 2	Package 3	Package 4
Monday	23	22	23	24
Tuesday	23	21	19	21
Wednesday	20	19	20	21
Thursday	18	19	20	19
Friday	18	20	22	20

1) Calculate upper 2-sigma x-bar chart control limit that allow for natural variations

2)Calculate lower 2-sigma x-bar chart control limit that allow for natural variations

3) Based on the x-bar chart, is this process in control?

A)Process is in control

B)Process is out of control

C)Process is almost within control limits

D)We don't have enough information