Let the mutually independent random variables X1, X2, and X3 be N(0, 1), N(2, 1), and N(−1, 1), respectively. Compute the probability that exactly two of these three variables are less than zero.

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Page 195, 3.4.16.* Let the mutually independent random variables X1, X2, and X3 be N(0, 1),
N(2, 1), and N(−1, 1), respectively. Compute the probability that exactly two of
these three variables are less than zero. 

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