Q. 114.2( 8 Votes )

# If the mean of x, x + 3, x + 5, x + 7, x + 10 is 9, the mean of the last three observation is

A.

B.

C.

D.

Answer :

Mean of 5 observations =

⇒ Mean of 5 observations

⇒ Mean = 9 (given)

⇒

⇒ 5x + 25 = 45

⇒ 5x = 45 – 25 = 20

⇒ x = 4.

Now,

Mean of three observations =

.

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