## xEnOnn Group Title There are 25 students at a bus stop. It is known that on average, 3 buses arrive at the bus stop in every 20 minutes. What is the probability that the waiting time for the next bus is at least 30 minutes? State the assumptions you need to compute the above probabilities. 2 years ago 2 years ago

1. xEnOnn Group Title

I believe it has got to do with Poisson distribution but I am not sure how to start from it. :(

2. xEnOnn Group Title

So the number of buses has become the interval instead? But isn't time the only unit for the interval in poisson?

3. xEnOnn Group Title

Also, the question asked for the assumptions that were made in computing the probabilities. What assumptions have we made in this calculation? I don't understand what kind of assumptions have we made.

4. Tributized Group Title

nice prof pic lol..

5. xEnOnn Group Title

Also, to have X~Pois(20/3), and find P(X>=30)=1-P(X<30), The P(X<30) is very close to 1. This would make P(X>=30)=1-1=0, which looks weird.

6. Zarkon Group Title

wouldn't it be Poisson$$\displaystyle\left(\frac{3}{20}\cdot 30\right)$$=Poisson(4.5)

7. Zarkon Group Title

Calculate P(X=0)

8. xEnOnn Group Title

Why calculate the probability of X=0?

9. Zarkon Group Title

0 buses arriving in the first 30 mins

10. xEnOnn Group Title

OHH!!! wow!! This is smart!

11. Zarkon Group Title

time to teach..be back later

12. xEnOnn Group Title

wow! this feels counter intuitive but somewhat logical. i wouldn't have thought of it. It's like so there is zero buses during the first 30mins and so this probability is as good as there is at least a bus after this first 30mins. thanks!!

13. xEnOnn Group Title

ok sure! Thanks for you help!!!