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What is the difference between step …

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What is the difference between step deviation method and assumed mean method in statistics

    • Posted by Vishnu Singh 5 years, 1 month ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Gaurav Seth 5 years, 1 month ago

    Both assumed mean method and step deviation method are ways to find mean without any complications...

    step deviation method is just an elaboration of assumed mean.

    1. Assumed Mean method:

    Step 1- Tabulate the continuous class intervals and frequency alongwith class marks.

      Class Mark = Upper Limit + Lower Limit

                                                2

    Step 2- Assume any of the class marks to be your  mean .

    Step 3- Take out the differences of the assumed mean and class marks.{ xi - a = di}

    Example if the class marks are 20, 30,40,50,60,70 and so on......and if the a =50 then,di is -30,-20,-10,0,10,20and so on.....

    Step 4: Multiply fi and di .

    Step5:  

      d  = sum of fidi

      sum of fi

    Step 6:  Mean = a + d

    0Thank You

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