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Depends on the salon in which they work really. Most would do 9-5 (8), but some may do 9-6 (9) and some days can be 9-9 (12).
Mean = (9 + 10 + 2 + 5 + 5)/5 = 31/5 = 6.2
Mean = Sum/Count = 38/5 = 7.6
The mean is found by adding the values together and dividing by the number of values. 5+7+9+11+13+9 = 54 54 divided by 6 is 9. The mean of 5, 7, 9, 11, 13, 9 is 9.
6 - 5/9 = 5 4/9