If the number of minutes that a doctor spends with a patient is a random variable having an exponential distribution with the parameter 9, what are the probabilities that it will take the doctor at least 20 minutes to treat (a) One patient (b) Two patients (c) Three patients ...

If the number of minutes that a doctor spends with a patient is a random variable having

Question:

If the number of minutes that a doctor spends with a patient is a random variable having an exponential with the parameter θ = 9, what are the probabilities that it will take the doctor at least 20 minutes to treat
(a) One patient;
(b) Two patients;
(c) Three patients?
Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...