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Find the mean and variance for each of t...

Find the mean and variance for each of the data : `6, 7, 10 , 12 , 13 , 4, 8, 12`

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Mean `barx=(sumx_(i))/n=72/8=9`
Variance `sigma^(2)=(sumd_(i)^(2))/n=74/8=9.25`
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