My Math Forum Central moments

 March 19th, 2010, 09:39 PM #1 Newbie   Joined: Feb 2010 Posts: 6 Thanks: 0 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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### how to find moment for question ungroup data

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