A random sample of size n; - 13 is selected from a normal population with a mean of 75 and a standard deviation of 7. A second random sample of size n2 - 6 is taken from another normal population with mean 69 and standard deviation 13. Let X1 and X2 be the two sample means. Find: (a) The probability that X – X2 exceeds 3. (b) The probability that 4.7

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