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

nice prof pic lol..

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

Calculate P(X=0)

Why calculate the probability of X=0?

0 buses arriving in the first 30 mins

OHH!!! wow!! This is smart!

time to teach..be back later

ok sure! Thanks for you help!!!