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Find the variance and standard deviation for the following distribution: X:, 4.5, 14.5, 24.5, 34.5, 44.5, 54.5, 64.5 `f:` , 1, 5, 12, 22, 17, 9, 4

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`xˉ=(∑Fx)/(∑F)​=(2635)/(70)​=37.64`
`σ^2=(∑F(x−xˉ)^2)/(∑F)=(12308.6​)/(70)=175.9`
`∴σ=13.26 .`
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