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Colonial Electric is a large company that produces lightbulbs

Colonial Electric is a large company that produces lightbulbs and other electrical appliances. One particular lightbulb is supposed to have an average life of about 1,000 hours before it burns out. Periodically the company will test 5 of these and measure the average time before these burn out. The following table gives the result of 10 such samples: Sample 1 2 3 4 5 6 7 8 9 10 Mean 979 1087 1080 934 1072 1007 952 986 1063 958 Range 50 94 57 65 135 134 101 98 145 84 1.What is the overall average of these means? What is the average range? 2.What are the upper and lower control limits for a 99.7% control chart for the mean? 3.Does this process appear to be in control? Explain. 4.Explain why a process can be out of control even though all the samples fall within the upper and lower control limit

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