Since the average is the sum divided by 10 (in this case 10, because there are 10 data items), it follows that the sum is 10 times as much.
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You calculate the sum of all the observations and divide the answer by the number of observations.
You add together all the observations for the variable of interest and divide the sum by the number of observations.
The mean of a series is equal to the sum divided by the number of items in the series. So, mean = sum/number, which means the sum is equal to the mean times the number. In this case, the sum is 3573.
This sum is zero, neutral.
mean=Sum of all observations(divided by)number of observations = 2+5+7+6(by)4 = 20(by)4 = 5