Question

The mean of x2 + 2, 2+4, X+6, x+8 is 11. find x​

Answer 1

Answer:

9

Step-by-step explanation:

Mean of the given observations = 11

The observations are : x,x+2,x+4,x+6,x+8

Mean =

Number of observations

Sum

=

5

x+x+2+x+4+x+6+x+8

Mean =

5

5x+20

= x+4

⇒x+4=11

⇒x=7

The first three observations are: 7,9,11

Mean of three observations =

3

7+9+11

= 9