P(A) means "Probability of Event A" The complement is shown by a little mark after the letter such as A' (or sometimes Ac or A): P(A') means "Probability of the complement of Event A" The two probabilities always add to 1.
The correct answer choice is D.
15 + 7 + 9 + 7 + 4 + 4 + 3 + 3 = 52
I believe the answer would be 30.76
