Question

if the mean of the observation x, x + 2 ,x+ 4 ,x + 6 and X + 8 is 11 then find the value of x

Answer 1

the mean of 5 observations x ,x+2,x+4,x+6,x+8
Is 13
Now,
A/q
(X+x+2+x+4+x+6+x+8)/5=13
5x+20=65
5x=65-20
5x=45
X=45/5=9
Therefore x will be 9

Answer 2

x, x + 2 ,x+ 4 ,x + 6 and X + 8

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

5x+20/5=11

5x+20=55

5x=35

x=7