14111cwir7ws.3

# 14111cwir7ws.3 - basketball and 10 students play neither of...

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5. A survey was done of students in which both their age and the number of pieces of candy they ate on Halloween was observed. The following results were obtained: Age 0 1 - 10 > 10 Total Under 18 5 30 45 80 18 - 20 20 50 40 110 Over 20 25 75 60 160 Total 50 155 145 350 (a) What is the probability that a student selected at random was under 18 and ate more than 10 pieces of candy? (b) What is the probability that a student selected at random ate 10 or fewer pieces of candy? (c) What is the probability that a student selected at random was over 20 or ate at least one piece of candy? 6. A survey was conducted of 80 freshmen. It was found that 50 students play intramural soccer, 60 students play intramural
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Unformatted text preview: basketball, and 10 students play neither of the two sports. If a student is selected at random, what is the probability that they play exactly one of the two sports? Section 7.4 • If S is a uniform sample space then P ( E ) = n ( E ) n ( S ) . 7. A bowl contains 30 red marbles, 15 green marbles, and 28 yellow marbles. An experiment consists of randomly selecting 5 marbles without replacement. (a) What is the probability of selecting exactly 2 red marbles? (b) What is the probability of selecting at least 1 green marble? (c) What is the probability of selecting exactly 2 red marbles or exactly 2 yellow marbles? 3...
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