A. Choudhury's bowling ball factory in Illinois makes bowling balls of adult size and weight only. The standard deviation in the weight of a bowling ball produced at the factory is known to be

0.39

pounds. Each day for 24 days, the average weight, in pounds, of

9

of the bowling balls produced that day has been assessed as follows:

Day	Average (lb.)	Day	Average (lb.)	Day	Average (lb.)	Day	Average (lb.)
1	16.2	7	16.1	13	15.9	19	16.1
2	15.9	8	16.0	14	15.9	20	16.1
3	16.1	9	16.1	15	15.9	21	16.0
4	16.1	10	16.0	16	15.9	22	16.0
5	16.0	11	16.1	17	15.9	23	16.1
6	16.0	12	16.1	18	16.1	24	15.9

Part 4b) If three standard deviations are used in the chart, what are the values of the control limits?

Upper Control Limit

(UCLx)=______________

lb. (round your response to two decimal places).