Question 1128325: On average, a ship arrives at a certain dock every second day. What is the probability that two or more ships will arrive on a randomly selected day?
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website! The parameter for this Poisson function (discrete, proportional, and theoretically could be infinite) is 0.5
Look at probability of 0 and 1 then subtract from 1 to get 2 or more.
For 0, e^(-0.5)0.5^0/0!=0.6065
for 1, e^(-0.5)0.5^1/1!=0.3033 Those probabilities add to 0.9098, so the probability of 2 or more on a given day is 0.0902
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