First slide

Introduction to statistics

Question

If the arithmetic mean of 7, 8, x, 11, 14 is $x,$ then $x =$

Moderate

Solution

We have,
$\frac{7 + 8 + x + 11 + 14}{5} = x \Rightarrow 40 + x = 5 x \Rightarrow x = 10$

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