Every day, Jane walks to the truck stop and the amount of time she will have to wait for the bus is between 0 and 12 minutes, with all times being equally likely (i.e., a uniform distribution). This means that the mean wait time is 6 minutes, with a variance of 12 minutes.

What is the probability that her total wait time over the course of 60 days is less than 6.5 hours?

0.868 - how did they get it