[問題] 麻煩各位解一下
The time between arrivals of cars at the Petroco Service Station is definedby \
the following probability distribution.
Time between arrivals(min) probability
1 0.15
2 0.30
3 0.40
4 0.15
Simulate the arrival of cars at the service station for 20arrivals,and compute\
the average time betweeen arrivals.
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