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Convert all the observations into seconds.Find their average.Divide the answer by 60 into a mixed fraction.Then, integer part of mixed fraction = minutes.Fractional part = seconds.
0 hours
Three hours and 15 minutes can be written as 3.25 hours or 3 1/4 hours.
3 1/2 hours.30 minutes = 30/60 = 3/6 = 1/2 hours