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A variable of two populations has a mean of 47 and a standard deviation of 11 for one of the populations and a mean of

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A variable of two populations has a mean of 47 and a standard deviation of 11 for one of the populations and a mean of 28 and a standard deviation of 12 for the other population. For independent samples of sizes 12 and 9, respectively, find the mean of x, - x2. O A. 19 O B. 75 OC. -19 OD. 0.8

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