Suppose that X is an exponential random variable with mean 5. (The cumulative distribution function is               F(x) = 1- e-x/5 for x >= 0, and F(x) = 0 for x < 0. (a) Compute P(X > 5).   (b) Compute P(1.4 <= X <= 4.2).   (c) Compute P(1.4 < X < 4.2).

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