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Find the mean for the given sample data. Unless otherwise specified, round your answer to one more decimal place than that used for the observations. Bill kept track of the number of hours he spent exercising each week. The results for four months, are shown below. Find the mean number of hours Bill spent exercising per week. 5.7 6.5 7.5 65 85 8.7 75 7.5 84 57 6.5 5.4 6.6 65 68 72 85 7.5 A 7.22 hr B 7.62 hr C 5,06 hr D 7.83 hr