Youngstown State University a. Is this a sample or a population? b. What is the mean enrollment? c. What is the median enrollment? d. What is the range of the enrollments? e. Compute the standard deviation. 78. Health issues are a concern of managers, especially as they evaluate the cost of medical insurance. A recent survey of 150 executives at Elvers Industries, a large insurance and financial firm located in the Southwest, reported the number of pounds by which the ex- ecutives were overweight. Compute the mean and the standard deviation. Pounds Overweight Frequency 0 up to 6 14 6 up to 12 42 12 up to 18 58 18 up to 24 28 24 up to 30 8 V79. The Apollo space program lasted from 1967 until 1972 and included 13 missions. The mis- sions lasted from as little as 7 hours to as long as 301 hours. The duration of each flight is listed below. 195 241 301 216 260 7 244 192 147 9 10 295 142CHAPTER 3 80. Creek Ratz is a very popular restaurant located along the coast of northam Florida. They serve a variety of steak and seafood dinners. During the summer beach season, they do not take reservations or accept "call ahead" seating. Management of the restaurant is con- E, please visit cerned with the time a patron must wait before being seated for dinner. Listed below is the om/lind16e wait time, in minutes, for the 25 tables seated last Saturday night. 23 67 37 28 56 40 28 50 28 39 51 45 44 65 61 27 24 61 34 44 64 25 24 27 29 a. Explain why the times are a population. b. Find the mean and median of the times. c. Find the range and the standard deviation of the times. 81. A sample of 25 undergraduates reported the following dollar amounts of entertainment expenses last year: please visit n/lind16e 684 710 688 711 722 698 723 743 738 722 696 721 685 763 681 731 736 771 693 701 737 717 752 710 697 a. Find the mean, median, and mode of this information. b. What are the range and standard deviation? observations. c. Use the Empirical Rule to establish an interval that includes about 95% of the 82. The Kentucky Derby is held the first Saturday in May at Churchill Downs in Louisville, Ken- ease visit tucky. The race track is one and one-quarter miles. The following table shows the winners since 1990, their margin of victory, the winning tim lind16e