First slide

Introduction to statistics

Question

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

Moderate

A

Relative frequency
B

M.D.
C

S.D.
D

0

Solution

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

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