If the mean of 10, 12, 18, 13, P and 17 is 15, find the value of P.

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Solution

The correct option is B 20
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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10, 12, 18, 13, P

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15

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Variable $(x_{i})$	$10$	$12$	$14$	$16$	$18$
Frequency $(f_{i})$	$13$	$p$	$15$	$32$	$28$

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