Answer :
The increase in the mean sales per hour for the second day when compared with the mean sale on the first day is 1.25.
What is the increase in the mean sales?
Mean is the average of a set of numbers. It is determined by adding the numbers together and dividing it by the total number
Mean sales on the first day = sum of the numbers / total number
(4 + 6 + 8 + 1 + 3 + 9 + 7 + 8) / 8 = 46/8 = 5.75
Mean sales on the second day = (46 + 10) / 8 = 7
Change in the mean = 7 - 5.75 = 1.25
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