Asked by Johnny

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?

a. x+y/2
b. x+y
c. Py+Nx/xy(P+N)
d. x+y/P+N
e. Px+Ny/P+N
Answered by Steve
totals are Px and Ny
so, the average we want is

(Px+Ny)/(P+N)