Question: Weight Day Package 1 Package 2 Package 3 Package 4 Monday 23 22 23 20 Tuesday 23 21 19 21 Wednesday 20 19 20 21

	Weight
Day	Package 1	Package 2	Package 3	Package 4
Monday	23	22	23	20
Tuesday	23	21	19	21
Wednesday	20	19	20	21
Thursday	18	19	20	17
Friday	18	20	22	22

Based on past experience, the process standard deviation is 1.5 ounces. Over the past week, four packages were randomly selected four packages with their weight. The sample mean for the days are 22, 21, 20,18.5 and 20.5, respectively. Answer all of the questions:

a) Calculate all sample mean. This is for all of the samples. Show work

b) Calculate upper and lower 2-sigma x-chart control limits. Show work

c) Based on the results, is this process in control?

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