Question

Why average of average is not equal to total average

Answer 1

if toal marks is 90 marks suppose average is 39 marks and if you will do it's everage then aprox it will be 12.5 and it is not equal to the total average

Answer 2

Answer:

In most of the cases, the overall average of separately averaged values is not equal to the average of the original set of numbers. They can be equal only if all of the averaged values are computed over the numeric sets with the same number of values. Average of these individual results equals to 5.5 hours.