Question 220381
Think of it like this:


There are 15-5=10 minutes in the interval from 5 minutes to 15 minutes. Also, from 2 minutes to 15 minutes, there are 13 minutes. So the chances of the bus being more than 5 minutes late is {{{10/13}}} (since there are 10 instances out of 13 that it could be 5 minutes or more late). It looks like you have the right idea for the numerator, but you just forgot to do the same for the denominator.