A random sample of size ₁ = 16 is selected from a normal population with a mean of 75 and a standard deviation of 8. A second random sample of size n2 = 9 is taken from another normal population with mean 70 and standard deviation 12. Let X₁ and X₂ be the two sample means. Find: (a) The probability that X₁ X₂, exceeds 4 (b) The probability that 3.5 ≤ X₁ – X₂ ≤ 5.5 -

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A: Only A is 29 Only B is 28 Only C is 26

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