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Arithmetic Mean and Range

If the arithm...

Question

If the arithmetic mean of $6, 8, 5, 7, x$ and $4$ is $7,$ then $x$ is

12

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8

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4

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Solution

The correct option is A $12$
By definition,
$A M = \frac{6 + 8 + 5 + 7 + x + 4}{6} = 7$
or $x = 12.$

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