There is a bus that come every 10 min. What is the probability that a person come at the exact moment the bus arrives if p(x) is 1/20 between 0 and 30, where x is the time? I think its 3/10, but how do you get this? When I integrate the function I get x/20, but the probability for P(X=0) is 0/20. P(X=10) = 10/20, and so on. I think there is something I didn't quite understand.