In: Advanced Math
The emergency room at Hosptal Systems, Inc. (HIS) serves patients who arrive according to a Poisson distribution at the rate of 9 per hour. Treatment takes an average of 6 minutes and the treatment times can be considered to follow an exponential distribution. What is the (a) minimum number of doctors required so that at least 70% of the arriving patients can receive treatment immediately? (b) minimum number of doctors required so that the average time a patient waits for treatment is no more than 30 minutes as advertised? No more than 15 minutes?
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The emergency room at Hosptal Systems, Inc. (HIS) serves patients who arrive according to a Poisson distribution at the rate of 9 per hour. Treatment takes an average of 6 minutes and the treatment times can be considered to follow an exponential distribution. What is the
EXPLANATION ::
(a) minimum number of doctors required so that at least 70% of the arriving patients can receive treatment immediately?
SOL ::
(a)
Arrival rate = 9 per hour
Service rate = 60/6 = 10 per hour
For 70% of the patients to receive treatment immediately, utilization rate must be at most = 1 - 70% = 30%
Therefore, minimum number of doctors required = Arrival rate / (Service rate * utilization rate)
= 9/(10*30%)
= 3 doctors
(b) minimum number of doctors required so that the average time a patient waits for treatment is no more than 30 minutes as advertised? No more than 15 minutes?
SOL ::
With multiple doctors, this is an M/M/s queue system
Operating characteristics are computed using the following spreadsheet
For target waiting time (Wq) <= 30 minutes or 0.5 hour, Look for Wq less than 0.5 in column I of the above spreadsheet.
The value of Wq just less than 0.5 is 0.0254 (=1.52 minutes) . Corresponding value of s = 2
So, 2 doctors are needed. Average waiting time is 1.52 minutes which is less than 30 minutes as well as 15 minutes.
So, a minimum of 2 doctors are needed.
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