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

Question

Philoid · Accepted 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 =

.