50 CHAPTER 2 Descriptive Statistics Graphical Analysis In Exercises 19 and 20, use the frequency histogram to (a) determine the number of classes. (b) estimate the greatest and least frequencies. (c) determine the class width. (d) describe any patterns with the data. 19. Frequency 50 100 150 200 250 300 44.5 54.5 Salary (in thousands of dollars) 34.5 64.5 74.5 84.5 94.5 Employee Salaries 20. Frequency 5 10 15 20 30 40 25 35 72 178 231 Height (in feet) 125 284 337 Roller Coaster Heights Graphical Analysis In Exercises 21 and 22, use the frequency polygon to identify the class with the greatest, and the class with the least, frequency. 21. 22. Frequency 4 8 12 16 14 10 6 2 Score 472 480 488 496 504 512 520 528 MCAT Scores for 90 Applicants Frequency 5 10 15 20 Distance (miles) 1 3 5 7 9 2 4 6 8 10 Commuting Distances for 70 Students, Ages 18−24 Graphical Analysis In Exercises 23 and 24, use the relative frequency histogram to (a) identify the class with the greatest, and the class with the least, relative frequency. (b) approximate the greatest and least relative frequencies. (c) describe any patterns with the data. 23. 24. Relative frequency 0.05 0.10 0.15 0.20 0.25 Length (in centimeters) 30.5 31.5 32.5 33.5 34.5 35.5 36.5 37.5 38.5 39.5 Female Fibula Lengths Relative frequency 10% 20% 30% 40% Time (in minutes) 10.5 11.5 12.5 13.5 14.5 Campus Security Response Times
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