The first of the two groups has 100 items with mean 45 and variance 49. if the combined group has 240 items with mean 51 amd variance 130, find the mean and standard deviation of the second group
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n1+ n_2 where d1 = m1 - a d2 = m2 - a a = mean of the whole group.Let m2 = mean of the second group.Therefor ...
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