NAME ________________________________________ DATE _____________ PERIOD _____ Reteach Histograms Data from a frequency table can be displayed as a histogram, a type of bar graph used to display numerical data that have been organized into equal intervals. These intervals show the frequency distribution of the data, or how many pieces of data are in each interval. Example 10 8 6 4 41 –5 0 9 9 –5 –4 50 restaurant. Choose intervals, make a frequency table, and construct a histogram to represent the data. 2 0 9 SODA The table shows the daily soda sales for a Ages of Teachers 10 8 6 4 –3 Exercise 1 40 For each interval, draw a bar whose height is given by the frequencies. 50–59 6 30 Step 3 40–49 9 Show the intervals from the frequency table on the horizontal axis. Label the vertical axis to show the frequencies. 9 ⁄ |||| |||| ⁄ | |||| | –2 Step 2 30–39 20 Draw and label a horizontal and vertical axis. Include a title. Age (yr) Number of Sodas Sold Daily 56 86 74 63 51 94 86 72 53 77 74 88 81 90 72 76 84 92 78 89 85 75 91 87 Course 1 • Analyze Data and Graphs Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc. Step 1 Ages of Teachers Age (yr) Tally Frequency 4 20–29 |||| Number of Teachers teachers at a middle school. Draw a histogram to represent the data. 31 –4 0 Weight (lb) Example TEACHERS The table shows the ages of 21 –3 0 11 –2 0 2 0 1– 10 dogs in the class weigh more than 20 pounds? Seven dogs weigh between 21 and 30 pounds, three dogs weigh between 31 and 40 pounds, and one dog weighs between 41 and 50 pounds. So, there are 7 + 3 + 1, or 11 dogs in the class that weight more than 20 pounds. Number of Dogs DOGS Refer to the histogram shown. How many Weights of Dogs in Obedience Class