SOLUTION: The probablity that Johnathon's train is on time is 3/8. The probability that the train is early is 5/13. What is the probability that the train is late?

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Question 944247: The probablity that Johnathon's train is on time is 3/8. The probability that the train is early is 5/13. What is the probability that the train is late?
Answer by Fombitz(32388) About Me  (Show Source):
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Since those are the only three possibilities (late, early or on-time), their sum must be 1.
P%2B3%2F8%2B5%2F13=1
P%2B%283%2F8%29%2813%2F13%29%2B%285%2F13%29%288%2F8%29=104%2F104
P%2B39%2F104%2B40%2F104=104%2F104
P%2B79%2F104=104%2F104
P=25%2F104