Question

Is the mean of the fire x, x + 2 x + 4 x + 6 x + 8, is 11 then the mean of the first three observation is?

Answer 1

hey

x+x+2+x+4+x+6+x+8 / 5 = 11
5x+20 = 55
5x = 55-20
5x = 35
x = 35/5
x = 7

Therefore the first three observations are 7,9 and 11

Answer 2

hey

x + x + 2x + 4x + 6x + 8 / 6 = 11

14x + 8 = 66

14x = 66 - 8

14x = 58

x = 58/14

x = 29/7