MATH 302-MIDTERM EXAM. Questions and Answers

MATH 302-MIDTERM EXAM. Questions and Answers Question 1 of 25 1.0/ 1.0 Points Which measure of central location is meaningful when the data are categorical? A.The mode B.The median C.The mean D.The range Answer Key: A Part 2 of 9 - 2.0/ 2.0 Points Question 2 of 25 1.0/ 1.0 Points What type of probability uses sample spaces to determine the numerical probability that an event will occur? A.subjective probability B.empirical probability C.conditional probability D.classical probability Answer Key: D Question 3 of 25 1.0/ 1.0 Points The formal way to revise probabilities based on new information is to use: A.common sense probabilities B.unilateral probabilities C.complementary probabilities D.conditional probabilities Answer Key: D Part 3 of 9 - 3.0/ 3.0 Points Question 4 of 25 1.0/ 1.0 Points Suppose that 50 identical batteries are being tested. After 8 hours of continuous use, assume that a given battery is still operating with a probability of 0.70 and has failed with a probability of 0.30. What is the probability that fewer than 40 batteries will last at least 8 hours? A.0.0789 B.0.9598 C.0.7986 D.0.9211 Answer Key: D Question 5 of 25 1.0/ 1.0 Points Find the variance of the following probability distribution. X P(X) 1 0.20 2 0.15 3 0.25 4 0.25