Question

1). If the mean of five observations x,
X+2, X+4 , X+6 , X+8 is 11. Find the
mean of first three observations.​

Answer 1

Answer:

ANSWER

Given observations x,x+2,x+4,x+6,x+8

∵

5

x+(x+2)+(x+4)+(x+6)+(x+8)

=11

⇒

5

5x+20

=11

⇒x=7

So, the observations are 7,9,11,13,15

Req. mean =

3

11+13+15

=13

Answer 2

Explanation:

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

5x=11-20

x=9/5

x=1.4