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If the mean o...

Question

If the mean of 10, 12, 18, 13, P and 17 is 15, then P = ___.

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Solution

We know that Mean $= \frac{\sum x_{i}}{n}$

$\Rightarrow 15 = \frac{10 + 12 + 18 + 13 + P + 17}{6}$

$\Rightarrow 90 = 70 + P$

$\Rightarrow P = 20$

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