Hallo Leute!
Hat sich jemand vl. zufällig mit folgender Fallstudie beschäftigt?
Ich stehe nämlich auf Schlauch...

The Yellow Cab Company owns four taxis. The taxi service operates for 10
hours daily. Calls arrive at the dispatching office according to a Poisson
distribution with a mean of 20 calls per hour. The length of the ride is
known to be exponential with mean 11,5 minutes. Because of the high demand
for cabs, Yellow limits the waiting list at the dispatching office to 16
customers. Once the limit is reached, future customers are advised to seek
service elsewhere of the expected long wait.

The company manager, Kyle Yellowstone, is afraid that he may be losing too
much business and thus would like to consider increasing the size of his
fleet. Yellowstone estimates that the average income per ride is about 5$.
He also estimates that a new cab can be purchased for 18.000$. A new cab
is kept in service for 5 years and then sold for 3.500$. The annual cost
of maintaining and operating a taxi is 20.000$ a year.