In an experiment, college students were given either four quarters or a $1 bill and they could either keep the money or spend it on gum. The results are summarized in the table. Complete parts (a) through (c) below. Purchased Gum Kept the Money 71 Students Given Four Quarters 32 11 Students Given a $1 Bill 13 28 E) a. Find the probability of randomly selecting a student who spent the money, given that the student was given four quarters. The probability is D. (Round to three decimal places as needed.) The data represent the results for a test for a certain disease. Assume one individual from the group is randomly selected. Find the probability of getting someone who tested negative, given that he or she had the disease. The individual actually had the disease Yes No CI Positive 1 39 17 Negative 15 'l 29 (E The probability is approximately |:|. (Round to three decimal places as needed.) The accompanying table shows the results from a test for a certain disease. The individual actually E Find the probability of selecting a subject with a negative test result, given that had the disease the subject has the disease. What would be an unfavorable consequence of Yes No this error? Positive 318 4 Negative 1? 1129 (I) The probability is D. (Round to three decimal places as needed.) Assume that there is a 11% rate of disk drive failure in a year. a. If all your computer data is stored on a hard disk drive with a copy stored on a second hard disk drive, what is the probability that during a year, you can avoid catastrophe with at least one working drive? b. If copies of all your computer data are stored on three independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive? E) a. With two hard disk drives, the probability that catastrophe can be avoided is D. (Round to four decimal places as needed.)