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Find sum f(i)d(i), if bar(d) = 1.2 and s...

Find `sum f_(i)d_(i)`, if `bar(d) = 1.2` and `sum f_(i) = 25`.

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The correct Answer is:
`sum f_(i)d_(i) = 30`
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Knowledge Check

  • If sum_(i=1)^(n) x_(i)^(2) =300 and sum_(i=1)^(n) x_(i) =50 then possible value of n is :

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