Patients  arrive  at  a  medical  cabinet  according  to  a  Poisson  distribution  at rate  of  6  patients  per  hour.  The  waiting  room  does  not  accommodate  more  than 4  patients.  Examination  time  per  patient  is  exponential  with  mean  15  min  and  is done  by  one  doctor.  What  is  the  probability  that  an  arriving  patient  will  not  wait?  What  is the  probability  that  an  arriving  patient  will  find  a  vacant  seat  in  the  room

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