Question

assertion if the mean of 5 observations is x x + 2 X + 4 x + 6 + 8 is 11 the mean of last three observation is it reason range equals to maximum value minus minimum value​

Answer 1

x + x + 2 + x + 4 + x + 6 + x + 8 / 5 = 11

5x + 20 =  55

5x = 35 ⇒ x = 7