Sarah and Thomas are going bowling. The probability that Sarah scores more than 175 is 0.4, and the probability that Thomas scores more than 175 is 0.2. Their scores are independent.
a. Find the probability that both score more than 175.
b. Given that Thomas scores more than 175, the probability that Sarah scores higher than Thomas is 0.3. Find the probability that Thomas scores more than 175 and Sarah scores higher than Thomas.
Let S denote Sarah’s score, and let T denote Thomas’s score.
(a) P(S >175 ? T >175) = P(S >175)P(T >175) = (0.4)(0.2) = 0.08.
(b) P(T >175 ? S > T) = P(T >175)P(S > T|T >175) = (0.2)(0.3) = 0.06.
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