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Midterm Exam_MATH302Question 1 of 25 1.0/ 1.0 PointsSuppose that a histogram of a data set is approximately symmetric and "bell shaped". Approximately what percent of the observations are within one standard deviation of the mean?A. 68% B. 50% C. 95% D. 99.7% Answer Key: A Question 2 of 25 1.0/ 1.0 PointsIf two events are mutually exclusive, what is the probability that one or the other occurs? A. 0.50 B. Cannot be determined from the information given. C. 0.25 D. 1.00 Answer Key: B Question 3 of 25 1.0/ 1.0 PointsIf A and B are any two events with P(A) = .8 and f$P(B|ar{A})= .7f$ then f$P(ar{A}igcap{B})f$ is: A. .24 B. 0.14 C. 0.875 D. 0.56 Answer Key: B Question 4 of 25 1.0/ 1.0 PointsA multiple choice quiz consists of 6 questions, each with 4 possible answers. If a student guesses at the answer to each question, then the mean number of correct answers is A. 6.00 B. 1.50 C. 4.00 D. 10.00
Answer Key: B Question 5 of 25 1.0/ 1.0 PointsA die is rolled 360 times. Find the standard deviation for the number of 3s that will be rolled. A. 60 B. 50 C. 7.1 D. 5.9 Answer Key: C Question 6 of 25 1.0/ 1.0 PointsFind the variance of the following probability distribution. X P(X) 1 0.10 2 0.20 3 0.35 4 0.30 5 0.05 A. 1.1 B. 1.21 C. 1.05 D. 1.02 Answer Key: A Question 7 of 25 1.0/ 1.0 PointsThe mean of a probability distribution is a: A. measure of variability of the distribution B. measure of skewness of the distribution C. measure of relative likelihood D. measure of central location Answer Key: D Question 8 of 25 1.0/ 1.0 Points
Find the probability, P(Z < 0.17), using the standard normal distribution. A. .8300 B. .4325 C. .5675 D. .0675 Answer Key: C Question 9 of 25 1.0/ 1.0 PointsGiven that the random variable X is normally distributed with a mean of 80 and a standard deviation of 10, P(85 < X < 90) is A. 0.1915 B. 0.1498 C. 0.5328 D. 0.3413 Answer Key: B Question 10 of 25 1.0/ 1.0 Points