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There are too many data points for a stem-and-leaf plot, because you usually make a stem-and-leaf plot by hand. b. This is not a good idea either; the ages of students in your class will be pretty much the same, and so you would have only one or two stems. c. This is a reasonable idea. There is some variation, and there are not too many data values. Answers to Check Your Work 51 Answers to Check Your Work 3. a. Discuss your answers with a classmate. These are sample answers. Advantages of a stem-and-leaf plot are that it can help you see the overall shape of the data, and it is easy to make one quickly.
8. a. How do you think these data were collected? b. Reflect Write three sentences about the data in the table. A box plot may help to summarize the distribution of the speeds of these animals. To make a box plot, remember that you have to divide the speeds into four equal groups. Bison Cat (domestic) Cheetah Chicken Coyote Elephant Elk Giraffe Gray Fox Greyhound Grizzly Bear Human Jackal Lion Mule Deer Pig (domestic) Pronghorn Antelope Quarter Horse Rabbit (domestic) Squirrel Warthog Wildebeest Wild Turkey Zebra 50 48 113 15 69 40 73 52 68 63 48 45 56 81 56 18 98 77 56 19 48 81 24 65 9.
Reflect What do you think about Russell’s comment? Section D: Histograms and the Mean 31 D Histograms and the Mean The mean is the sum of the data values divided by the total number of values. The mean is a number that can be used to summarize the “center” of a group of data. An easy way to find the mean of a set of data is to add all of the numbers and divide by the number of data points. Often the mean is not even a data point. Sometimes the mean seems to be typical of the data points, and sometimes it does not.