First slide

Introduction to statistics

Question

If the average of $a, b, c$ and $d$ is the average of $b$ and $c$ , then which one of the following is necessarily true

Moderate

Solution

It is given that
$\frac{a + b + c + d}{4} = \frac{b + c}{2} \Rightarrow \frac{a + d}{4} = \frac{b + c}{4} \Rightarrow a + d = b + c$

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