Question

The mean of x y and z is 20. find the mean of x-5 y+4 z-5

Answer 1

18

Explanation:

Sum of x, y and z = 20 × 3

= 60

x-5+y+4+z-5 = 60-5+4-5

= 54

Mean of x-5, y+4 and z-5

= 54 ÷ 3

= 18