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March 19th, 2010, 09:39 PM   #1
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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 ?1(a)=0.5 , ?2(a)=1.5 , ?3(a)=-2 and ?4(a)= 4.5

I get these values correct by the formula
?1(a)=mean-assumed mean
?2(a)=?2-?1(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.
?1,?2,?3,?4

I have found answers of
?1=0
?2=1.25

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

?3=0
and
?4=2.56

else i get some big values can anybody help me please
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