Question: A random variable X is created by summing up four independent exponential random variables with means 5, 10, 15, and 20, respectively. Let #3; denote

A random variable X is created by summing up four independent exponential random variables with means 5, 10, 15, and 20, respectively. Let #3; denote the mean of X. Find the Chebyshev bound for P (lX \"3| 2 40)

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