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{21) Let X represent the waiting time {in minutes) for patients at a doctor's ofce. Suppose X c a if {I *1: a: *1: 25

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{21) Let X represent the waiting time {in minutes) for patients at a doctor's ofce. Suppose X c a if {I *1: a: *1: 25 has the probability density function at} = where c is constant. I} otherwise {a} Find the value of e. {h} Find the expected value of X. {c} Find the variance of X

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