First slide

Introduction to statistics

Question

If $μ$ is the mean of distribution $(y_{i}, f_{i}), then {Σf}_{i} (y_{i} - μ) =$

Easy

A

M.D
B

S.D
C

0
D

Relative frequency

Solution

We have,
$\sum f_{i} (y_{i} - μ) = \sum f_{i} y_{i} - μ \sum f_{i} = μ \sum f_{i} - μ \sum f_{i} = 0 [∵ μ = \frac{\sum f_{i} y_{i}}{\sum f_{i}}]$

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