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In a frequency distribution , if a =assu...

In a frequency distribution , if a =assumed mean = 55 , `sumf_(i) = 100 , h = 10 and sumf_(i)mu_(i)= -30` , then find the mean of the distribution.

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Knowledge Check

  • If A = 55.5 , N = 100 , C = 20 , and sumf_(i)d_(i) = 60 , then find the mean from the given data .

    A
    67.5
    B
    57.5
    C
    77.5
    D
    47.5

  • If sumf_(i)=20 , sumf_(i)x_(i)=120+y and barX=7 , then y=?

    A
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    B
    `20`
    C
    `30`
    D
    `40`

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