The mean of 8, 11, 6, 14, x and 13 is 66. Find the value of x.

4.5

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5.5

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6.5

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Solution

The correct option is A
4.5

$\frac{8 + 11 + 6 + 14 + x + 13}{6} = 66$

$\frac{52 + x}{6} = 66$
$52 + x = 66 \times 6$
$52 + x = 396$
$x = 344$

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