Question

If the mean of five observations x+2,x+4,x+6 and x+8 is 13 then find the value of x

Answer 1

(x+x+2+x+4+x+6+x+8)/5=13
5x+20=65
5x=65-20=45
x=45/5=9

Answer 2

{x+(x+2)+(x+4)+(x+6)+(x+8)}/5=13
{x+(x+2)+(x+4)+(x+6)+(x+8)}=13×5=65
5x+20=65
5x=45
x=9