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Following are the marks obtained ,out of 100, by two student Ravi and Hashina in 10 tests Who is more intellogent and who is more consistent ?

Answer»


Solution :
`sigma=sqrt((Sigmad^(2)i)/N-((Sigmad_(i))/n)^(2))` ltbr gt `=sqrt((1699)/10-((-14)/10)^(2))=sqrt(169.9-0.0196)`
`=sqrt(169.88)=13.03`
Now`barx=A+(Sigmad_(i))/(Sigmaf_(i))=45-14/10=43.6`

`thereforeMean = 55`
`becausesigma =sqrt(6368)/(10)=sqrt(636.8)=25.2`
For Ravi`CV=(sigma)/(x)xx100=(13.03)/(43.6)xx100=29.88`
For HASHINA`CV=(sigma )/(x)xx100=(25.5)/(55)xx100=45.89`
Hence ,HASINA is more consistent and inlligent .


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