SECTION 2.1 Frequency Distributions and Their Graphs 51 Graphical Analysis In Exercises 25 and 26, use the ogive to approximate (a) the number in the sample. (b) the location of the greatest increase in frequency. 25. Weight (in pounds) Cumulative frequency 10 20 30 50 70 40 60 80 72.5 Black Bears 115.5 158.5 201.5 244.5 287.5 330.5 373.5 459.5 416.5 26. Cumulative frequency 10 20 30 40 50 60 70 80 Height (in inches) 64 66 68 70 72 74 76 Adult Males 27. Use the ogive in Exercise 25 to approximate (a) the cumulative frequency for a weight of 201.5 pounds. (b) the weight for which the cumulative frequency is 68. (c) the number of black bears that weigh between 158.5 pounds and 244.5 pounds. (d) the number of black bears that weigh more than 330.5 pounds. 28. Use the ogive in Exercise 26 to approximate (a) the cumulative frequency for a height of 72 inches. (b) the height for which the cumulative frequency is 15. (c) the number of adult males that are between 68 and 72 inches tall. (d) the number of adult males that are taller than 70 inches. Using and Interpreting Concepts Constructing a Frequency Distribution In Exercises 29 and 30, construct a frequency distribution for the data set using the indicated number of classes. In the table, include the midpoints, relative frequencies, and cumulative frequencies. Which class has the greatest class frequency and which has the least class frequency? 29. YouTube Watching Times Number of classes: 5 Data set: Times (in minutes) spent watching YouTube videos in a day 100 32 125 164 123 149 73 88 87 104 110 98 122 28 177 69 90 68 125 90 118 123 139 175 30. Textbook Spending Number of classes: 6 Data set: Amounts (in dollars) spent on textbooks for a semester 91 472 279 249 530 376 188 341 266 199 142 273 189 130 489 266 248 101 375 486 190 398 188 269 43 30 127 354 84 319 indicates that the data set for this exercise is available within MyStatLab or at www.pearsonhighered.com/mathstatsresources.
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