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Arithmetic Mean and Range

The number of...

Question

The number of children in $10$ families in a locality are $2, 4, 3, 4, 1, 6, 4, 5, x, 5$ . Find $x$ if the mean number of children in a family is $4$ .

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Solution

Given mean $= 4$
$∴ \frac{2 + 4 + 3 + 4 + 1 + 6 + 4 + 5 + x + 5}{10} = 4 => \frac{34 + x}{10} = 4 => 34 + x = 40 => x = 6$

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Q. The number of children in 10 families of a locality are:
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