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OpenStudy (anonymous):
The average of P numbers is x, and the average of N numbers is y. What is the average of all the (P+N) numbers?
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OpenStudy (kropot72):
The sum of the P numbers is P * x The sum of the N numbers is N * y The total sum is (P * x) + (N * y) ...............(1) The total quantity of numbers is (P + N) ............(2) The average of all the (P + N) numbers is (1)/(2)
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