ABC Electric is a large company that produces lightbulbs and other electrical products. One particular lightbulb is supposed to have an average life of about 1,000 hours before it burns out.Periodically, the company will test five of these and measure the average time before these burn out.The following table gives the results of 10 such samples:

Sample1 2 3 4 5 6 7 8 9 10

Mean9791087 1080 934 1072 1007 952 986 1063 958

Range50 94 57 65 135 134 101 98 145 84

1. What are the upper and lower control limits for a 99.7% (three-sigmas) control chart for the mean? (In a Mac environment, the default is always 99.7%, or three sigmas.
2. Does the process appear to be in control?Explain fully.

Use Windows for QM. The problem must be submitted by Saturday and is worth eight points.