humpback wrote:The 20 numbers on list A have a mean on 9.5
The 10 numbers on list B have an average of 8.3
If the two list are combined to make a new list, what is the average of the 30 numbers in the new list?
Sum of list A = number*average = 20(9.5) = 190.
Sum of list B = number*average = 10(8.3) = 83.
Average of the new list = sum/number = (190+83)/30 = 273/30 = 9.1.
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