If the mean of five observations $x,\ x + 2,\ x + 4,\ x + 6$ and $x + 8$ is 11, then the mean of last three observations is

Question

Dr. Abubacker · Accepted Answer

(a)
Since, $\frac{x + (x + 2) + (x + 4) + (x + 6) + (x + 8)}{5} = 11$
$\Rightarrow \ \ \frac{5x + 20}{5} = 11\  \Rightarrow x = 7$
$	herefore$ Mean of the last three values $= \frac{11 + 13 + 15}{3} = 15$

Q. If the mean of five observations $x,\ x + 2,\ x + 4,\ x + 6$ and $x + 8$ is 11, then the mean of last three observations is

Explanation

Reviewed by Dr. Abubacker

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