Question

if the mean of a set of observations x1,x2.....x10 is 20.Find the mean of x1+4,x2+8,x3+12,......x10+40.

Answer 1

x3+12,x4+16,x5+20,x6+24,x7+28,

x8+32,x9+36,x10+40

Answer 2

For this ap has to be used.....the sum of the multiples of 4