- 10 22 2 11 Pm 11 College Students Are Randomly Selected And Arranged In Groups Of Three The Random Variable X Is The N 1 (68.4 KiB) Viewed 49 times
10/22,2:11 PM 11. College students are randomly selected and arranged in groups of three. The random variable x is the number in the group who say that they take one or more online courses. Determine whether a probability distribution is given. If a probability distribution is given, find its mean and standard deviation. If a probability distribution is not given, identify the requirements that are not satisfied. Does the table show a probability distribution? Select all that apply. A. Yes, the table shows a probability distribution. B. No, not every probability is between 0 and 1 inclusive. C. No, the numerical values of the random variable x are not associated with probabilities. D. No, the random variable x is categorical instead of numerical E. No, the sum of all the probabilities is not equal to 1. OA. H students (Round to one decimal place as needed.) B. The table does not show a probability distribution. Find the mean of the random variable x. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. OA. G= students (Round to one decimal place as needed.) B. The table does not show a probability distribution. x 0 Find the standard deviation of the random variable x. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. P(x) 0.109 0.353 0.394 P(CCW)-see above P(CWC)= P(WCC) = (Type exact answers.) 1 2 3 0.144 12. Multiple-choice
questions each have five possible answers (a, b, c, d, e), one of which is correct. Assume that you guess the answers to three such
questions. a. Use the multiplication rule to find P(CCW), where C denotes a correct answer and W denotes a wrong answer. P(CCW) = (Type an exact answer.) b. Beginning with CCW, make a complete list of the different possible arrangements of two correct answers and one wrong answer, then find the probability for each entry in the list. (Type an exact answer.) c. Based on the preceding results, what is the probability of getting exactly two correct answers when three guesses are made?