Precalculus Practice Test Questions and Answers

Precalculus Practice Test Questions and Answers What are mutually exclusive events? - Answer-Events in which neither event is dependent upon the other A number is chosen at random from the first 100 positive integers. Find the probability that the number chosen is prime. - Answer-1/4 A number is chosen at random from the first 100 positive integers. Find the probability that the number is divisible by 5. - Answer-1/5 A number is chosen at random from the first 100 positive integers. Find the probability that the number is a multiple of 7. - Answer-7/50 A number is chosen at random from the first 100 positive integers. Find the probability that the number is either even or a perfect square. - Answer-11/20 A number is chosen at random from the first 100 positive integers. Find the probability that the number is not divisible by 10 or 3. - Answer-3/5 A certain class of 160 students has 40 honor students and 60 athletes. Eighty students in the class do not participate in sports and are not honor students. If a student is selected at random to represent the class, what is the probability that he is both an honor student and an athlete? - Answer-1/8 A number is selected from the set {1, 2, 3, 5, 15, 21, 29, 38, 500}. If equal elemental probabilities are assigned, what is the probability that the number chosen is either less than 29 or odd? - Answer-7/9 Independent events are ______. - Answer-events in which the probability of A has no effect on the probability of B A class of 160 students contains 40 honor students, 60 athletes, and 80 who are neither athletes nor honor students. From the entire group a student is chosen at random. What is the probability that the student chosen is an honor student given that he is an athlete? - Answer-I believe 1/2