There are two more assignments in a class before its end, and if you get an A on at least one of them, you will get an A for the semester. Your subjective assessment of your performance is
Event
Probability
A on paper and A on exam ..25
A on paper only .35
A on exam only .30
A on neither .10
What is the probability of getting an A on the paper?
What is the probability of getting an A on the exam?
What is the probability of getting an A in the course?
Are the grades on the assignments independent?