Q11 of 174 Page 597

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

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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