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If overset(10)underset(r=1)Sigmax(i) =...

If
`overset(10)underset(r=1)Sigmax_(i) = 110 and overset(10)underset(i=1)Sigma x_(i)^(2)=1540`
then what is the variance ?

A

22

B

33

C

44

D

55

Text Solution

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sum of the series overset(n)underset(r=1)Sigma (r) /(r+1! ) is

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