Mathematics, 07.11.2019 04:31 jamesgotqui6
Abuilding contains two elevators, one fast and one slow. the average waiting time for the slow elevator is 3 min. and the average waiting time of the fast elevator is 1 min. if a passenger chooses the first elevator with probability 2 3 and the slow elevator with probability 1 3 , what is the expected waiting time?
Answers: 3
![E[x]=\sum xp(x)=3\times \dfrac{1}{3}+1\times \dfrac{2}{3}\\\\=1+\dfrac{2}{3}\\\\=\dfrac{3+2}{3}\\\\=\dfrac{5}{3}\\\\=1\dfrac{2}{3}\ min](/tpl/images/0363/2793/4a25b.png)
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Abuilding contains two elevators, one fast and one slow. the average waiting time for the slow eleva...
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