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Find the mean and standard deviation usi...

Find the mean and standard deviation using short cut method

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Let assumed mean `A=64`
`:.` Mean `=A+(sumf_(i)d_(i))/(sumf_(i))=64+0/100`
`=64`
Standard deviation `=sqrt((sumf_(i)d_(i)^(2))/N-((sumf_(i)d_(i))/N)^(2))`
`=sqrt(286/100-0)=sqrt(286/100)`
`=sqrt(2.86)=1.69`
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