and X, be independent normally distributed random variables. X,has a normal distribution with mean 1 and variance 4. X, has a normal distribution with mean 2 and 2. Let X1 X2 variance 9, and X, has a normal distribution with mean 3 and variance 16. a. Find the probability that all the X's are greater than one. D. Find the probability that exactly two of the X's are greater than one.

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