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calculation of skewness

calculation of skewness

GLeela -
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Sir Greetings!

In the following fig for the second data skewness is given as 0.9

But i am unable to arrive 0.9 sir.

3(mean-median)/sd

3(28-20)/21

=1.142 am i correct sir.pl help me to solve it sir.

i have attached the file.

with warm regards

Leela.G

附件 fig3.JPG