A has of Jellybeans contains 20!] beans, of which 30 are red. Susan reaches into the bag and pulls out 15 beans at random. To model this experiment using a normal distribution, what standard deviation should you use? a. 1.913 c. 1.333 b. 1.??3 d. 1.333 A card is randomly drawn form a deck of 52. Drawing a diamond Is a success and anything else is a failure. The card is replaced and the deck is shufed. The experiment is repeated 30 times. To model this experiment using a normal distribution, what mean and standard deviation should you use? a. Mean = 7.5, SD = 2.372 c. Mean = 2.739, SD = 2.372 b. Mean = 7.5, SD = 5.625 :1. Mean = 2.735, SD = 5.625 A poll conducted by the student newspaper found that 7856 of the students who ate lunch at the school cafeteria ordered a salad at least twice per week. The poll ls considered accurate within i 5%, 17 times out of 20. What Is the condence level for the poll? 3. 305% c. 55% b. 8596 d. 93% Which statement is true concerning a normal distribution? a. The curve is symmetrical about a central peak b. The median is always less than the mean c. All of the data values will occur within two standard deviation of the mean d. The mean of a sample always matches the mean of the underlying normal distribution Use this information to answer question #9 8!. #10 Roberta rides her bicycle to school. She records her time for one week, and determines a mean of 10.2 min and a standard deviation of 2.4 min. She believes the time follows a normal distribution. What is the z-score for a trip that takes 13.8 min? a. -3.6 b. -1.5 C. 1.5 d. 3.6