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Properties of Measures of Central Tendency

The numbers 4...

Question

The numbers 4, 6 and 8 are the frequencies (x + 2), X and(x-1) and if their arithmetic mean is 8, the value of X is

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Solution

The correct option is D 8
$8 = \frac{4 \times (x + 2) + 6 x + 8 \times (x - 1)}{4 + 6 + 8}$
$= \frac{4 x + 8 + 6 x + 8 x - 8}{18} ∴ x = 8$

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