In STAT4800-W02, there are two term tests and, it is believed that the term test 2 is harder than the term test 1

In STAT4800-W02, there are two term tests and, it is believed that the term test 2 is harder than the term test 1. You believe the probability you pass the term test 1 is 70%. If you pass the term test 1, the probability you also pass the term test 2 will be 80%, and if you fail the term test 1, the probability you pass the term test 2 will be 20%. Let  be the number of term tests you pass. a) Find the probability model for . b) Find and interpret the expected number of tests you pass. What is your recommendation to your friend, about this instructor, who is planning to take the STAT4800 in next semester?