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Find the mean of the following frequency...

Find the mean of the following frequency distribution: Class-interval:    0-10         10-20                           20-30       30-40                           40-50 No. of workers f:                7                           10            15                           8              10

Text Solution

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`A=25,h=10,N=50` and `Sum f_iu_i=4`
Mean=`A+h[1/Nsumf_iu_i]`
Mean=`25+10+40/50=25.8`
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Knowledge Check

  • The median of the following frequency distribution is {:("Class interval",f),(" "0-10,5),(" "10-20,8),(" "20-30,7),(" "30-40,10),(" "40-50,20):}

    A
    35
    B
    30
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    45

  • Find the mean of the following continuous distribution. {("Class Interval",f),(" "0-10,8),(" "10-20,4),(" "20-30,6),(" "30-40,3),(" "40-50,4):}

    A
    20.8
    B
    21.4
    C
    21.8
    D
    22.2

  • The median class in the following frequency distribution is {:("Class interval :",0-10,10-20,20-30,30-40,40-50),("Frequency :",12,13,25,20,10):}

    A
    `10-20`
    B
    `20-30`
    C
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    D
    none of these

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