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(23) Let X be the length, in hours, of a surgical procedure. Suppose X is exponentially distributed with parameter * = =. (a) Find the

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(23) Let X be the length, in hours, of a surgical procedure. Suppose X is exponentially distributed with parameter * = =. (a) Find the formula for the density function f(x) of X. (b) Find the probability that the procedure will take more than 8 hours. (c) Find the mean and variance of X (do not compute any integrals). (See class notes from 3/8/2022)

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