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For two groups of observations the following data is available: Group Group 11 (X - 5) = 3 E(X-8) = -11 (X - 5)2 =

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For two groups of observations the following data is available: Group Group 11 (X - 5) = 3 E(X-8) = -11 (X - 5)2 = 43 2(X-8)2 = 76 n = 18 n = 17 n Find the mean and the standard deviation of the 35 observations obtained by combining the two groups

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