Julie is taking English and history. Suppose that at the outset of the term, her probabilities for getting As are
P(grade of A in English class) = .70.
P(grade of A in history class) = .60.
P(grade of A in both English and history classes) = .50.
a. Are the events "grade of A in English class" and "grade of A in history class" independent? Explain how you know.
b. Use the addition rule for two events (Rule 2) to find the probability that Julie will get at least one A between her English and history classes.