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December 4th, 2013, 03:11 AM   #1
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Compute the average waiting time

Hello,

For an exam, I have to compute the average waiting time of a person on a line of an ATM, using discrete distribution probabilities on excel.
I looked a lot of tuto and forum but didn't find how to solve it. Teacher was talking of random number and of the formula IF(...), but no idea how to use it in this case.

Here is the subject:

Interarrival time = Discrete distribution
1 min with a probability of p1
2 min with a probability of p2
3 min with a probability of p3

Service time = Discrete distribution
1.5 min with a probability of p1
2.5 min with a probability of p2
3.5 min with a probability of p3

Interarrival time / p1 = 5% / p2 = 55% / p3 = 40%
Service time / p1 = 25% / p2 = 40% / p3 = 35%


Please help me!!!
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