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

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Correct option is D

We have, ∑fiyi−μ=∑fiyi−μΣfi=μ∑fi−μΣfi=0 ∵μ=∑fiyi∑fi

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Variate x	1	2	3	4	5
Frequency f of x	4	5	y	1	2

If μ is the mean of distribution yi,fi , then Σfiyi−μ=

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