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Math Help - Central moments

  1. #1
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    Post Central moments

    I dont know where this question goes If it is in wrong section please put it in correct, Next time i will not do mistake

    well so the question is

    Find the first four central moments for following
    Its ungrouped data
    1)4,3,6,5

    and the book also gives the answers

    that μ1(a)=0.5 , μ2(a)=1.5 , μ3(a)=-2 and μ4(a)= 4.5

    I get these values correct by the formula
    μ1(a)=mean-assumed mean
    μ2(a)=μ2-μ1(a)^2

    I took the assumed mean 5 by calculating 4+3+6+5/4

    But now i have to find central moments

    i.e.
    μ1,μ2,μ3,μ4

    I have found answers of
    μ1=0
    μ2=1.25

    But i am not getting the following answers Which the book is given

    μ3=0
    and
    μ4=2.56

    else i get some big values can anybody help me please
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  2. #2
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    No replays Yet its about a month
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