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Find the value of Sigmaf(i) d(i) for the...

Find the value of `Sigmaf_(i) d_(i)` for the following information.
`(i) bard = 1.2 , Sigmaf_(i) = 15 " "(ii) bar d = 1.75, Sigmaf_(i) = 80`

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The correct Answer is:
`(i) Sigma f_(i) d_(i) = 18 (ii) Sigma f_(i) d_(i) = 140`
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