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Find the mean and variance of the freque...

Find the mean and variance of the frequency distribution given below

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`therefore " Mean "=(Sigmaf_(i)x_(i))/(Sigma f_(i))=(66.5)/(16)=4.15`
and variance `=sigma^(2)=(Sigmaf_(i)x_(i)^(2))/(Sigmaf_(i))-((Sigmaf_(i)x_(i))/(Sigmaf_(i)))^2`
`(340.25)/(21.2656-17.2225)=4.043`
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