Re: DSE 2004 Doubt plz help

Posted by Granpa Simpson on Jun 23, 2014; 12:00pm
URL: http://discussion-forum.276.s1.nabble.com/DSE-2004-Doubt-plz-help-tp7593411p7593412.html

Original Mean=0
Corrected Mean=0-{(-5)-11}+{(-6)+11}=0.
Now, original variance=4,
Thus sum(xi^2)=4*10=40.
Now corrected sum(xi^2)=40-(25+121)+(36+144)=74.
Now new variance=1/n*corrected sum(xi^2)-(Corrected Mean)^2.
Since corrected mean=0, new variance=1/n*corrected sum(xi^2)=74/10=7.4