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Insertion of AM's Between 2 Numbers

If the arithm...

Question

If the arithmetic mean of $7, 8, x, 11, 14$ is $x$ , then $x =$

A

9

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B

9.5

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C

10

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D

10.5

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Solution

The correct option is C $10$
We have
$\frac{7 + 8 + x + 11 + 14}{5} = x \Rightarrow 40 + x = 5 x \Rightarrow x = 10$

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