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If the number of minutes a doctor spends with a patient is a random variable having an exponential distribution with the parameter = 9n,

If the number of minutes a doctor spends with a patient is a random  variable having an exponential distribution with the parameter θ = 9n,  what are the probabilities that it will take the doctor at least 20 minutes to  treat: (i) One patient; [2 marks] (ii) Three patients

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