=15-16 Colonel 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 5 of these and measure the average time before these burn out. The following table gives the results of 10 such samples:

Sample No. x R Sample No. x R Sample No. x R 1 63.5 2.0 10 63.5 1.3 18 63.6 1.8 2 63.6 1.0 11 63.3 1.8 19 63.8 1.3 3 63.7 1.7 12 63.2 1.0 20 63.5 1.6 4 63.9 0.9 13 63.6 1.8 21 63.9 1.0 5 63.4 1.2 14 63.3 1.5 22 63.2 1.8 6 63.0 1.6 15 63.4 1.7 23 63.3 1.7 7 63.2 1.8 16 63.4 1.4 24 64.0 2.0 8 63.3 1.3 17 63.5 1.1 25 63.4 1.5 9 63.7 1.6 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