A random sample of sizen; -15 is selected from a normal population with a mean of 74 and a standard deviation of 9. A second random sample of size n-6 is taken from another normal population with mean 68 and standard deviation 14. Let X, and X₂ be the two sample means. Find: (a) The probability that X₁-X, exceeds 4. (b) The probability that 4.8 X₁-X 5.1. Round your answers to two decimal places (e.g. 98.76). (a) i (b) i

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