statistics

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At a certain college, 15% of the students received an A in their required math course, 10% receieved an A in their required chemistry course, and 5% received an A in both. A student is selected at random.

a.) What is the probability that he received an A in either chemistry or math?

b.) What is the probability that he received an A in chemistry, if he had an A in math?

c.) What is the probability that he received an A in math, if he had an A in chemistry?

d.) Are the events " A in math" and "A in chemistry" independent?

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