Question: how to solve this - --- gy -- 10.21 A variable of two populations has a mean of 40 and a standard deviation of 12

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- --- gy -- 10.21 A variable of two populations has a mean of 40 and a standard deviation of 12 for one of the populations and a mean of 40 and a stan- dard deviation of 6 for the other population. Moreover, the variable is normally distributed on each of the two populations. a. For independent samples of sizes 9 and 4, respectively, determine the mean and standard deviation of ; X. b. Can you conclude that the variable

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