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If two random samples of sizes 30 and 36 are selected independently from two populations with means 78 and 85, and standard deviations 12 and

If two random samples of sizes 30 and 36 are selected independently from two populations with means 78 and 85, and standard deviations 12 and 15, respectively, then probability that the mean of the 1st sample will be larger than the mean of the 2nd sample is: ?

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