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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