The numbers 3, 5, 6 and 4 have frequencies of $x, x + 2, x - 8$ and $x + 6$ respectively. If their mean is 4 then the value of x is

5

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6

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4

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8

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Solution

The correct option is C $4$
From given data,
Mean $= \frac{s u m o f a l l f r e q u e n c i e s}{N o . o f f r e q u e n c y}$

$4 = \frac{x + (x + 2) + (x - 8) + (x + 6)}{4}$
$4 = \frac{4 x}{4}$

$x = 4$ .

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