39. In Hillcross High School there are 300 freshmen, 280 sophomores, 275 juniors, and 256 seniors. What is the probabili

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39 In Hillcross High School There Are 300 Freshmen 280 Sophomores 275 Juniors And 256 Seniors What Is The Probabili 1 (52.45 KiB) Viewed 57 times

39. In Hillcross High School there are 300 freshmen, 280 sophomores, 275 juniors, and 256 seniors. What is the probability that a student selected at random will be (a) a freshman? (b) a sophomore? (c) a junior? (d) a senior? 40. Are the following pairs of events mutually exclusive? a) Living in Cary and working in Raleigh. b) Being a freshman and being a junior in high school. c) Being a professor and being an author of a book. d) Drawing a red card and drawing the ace of spades. e) Drawing a face card and drawing the six of hearts from a normal deck of cards. 41. If the probabilities that Joan, Beverly and Evelyn will be elected secretary of a ski club are 1/8, 2/5, and 1/3 respectively, find the probability that one of the three will be elected. 42. If the probabilities that John and Harry will be valedictorian of a high school class are 1/4 and 3/7 respectively, what is the probability that either John or Harry will be valedictorian? 43. Chris and Janet are among twenty girls who enter a tennis tournament. What is the probability that either one of these two girls will win the tournament?