Bryan Adams High School Hallway by flickr user Dean Terry

Raul has work only on weekdays for 3 times a week on Tuesday, Wednesday, and Thursday. If he has work, then he is late to school the next day 75% of the time. If he doesn't have work, then he's only late 25% of the time.

a)What is the probability he had work the day before given that he was late to school?

b)What is the probability that Raul arrives on time for school?

a)What is the probability he had work the day before given that he was late to school?

b)What is the probability that Raul arrives on time for school?