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Arithmetic Mean and Range

Question

If the mean of $8, 12, 21, 42, x$ is $20$ find the value of $x$ .

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Solution

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Given
Mean of $8, 12, 21, 42, x$ is $20$
$⟹ \frac{8 + 12 + 21 + 42 + x}{5} = 20$
$⟹ x + 83 = 100$
$⟹ x = 17$

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