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Histograms

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Vocabulary Histogram- a bar graph that shows the frequency of data within equal intervals. There is no space between the bars in a histogram.

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The histogram shows the results of a survey asking people the number of hours they sleep per night. Use the histogram to answer each question. Additional Example 1A: Analyzing Histograms A. How many people sleep less than 9 hous per night? Add the number of students in the 3-5 and 6-8 intervals. 23 + 58 = 78 78 people sleep less than 9 hous per night.

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Additional Example 1B: Analyzing Histograms B. What is the approximate median number of hours people sleep per night? Since 100 people were surveyed, the median is the mean of the 50th and 51st persons hours. The 50th and 51st persons hours are in the middle of the 6-8 interval. So, a good estimated is 7 hours. IntervalFrequencyRank (by weight) 3-5251-25 6-85326-78 9-111779-95 12-14596-100 Determine the interval of the 50th and 51st people.

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The histogram shows the results of a local 10K race. Use the histogram to answer each question. Check It Out: Example 1

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Check It Out: Example 1 Continued A. How many runners completed the race in less than 50 minutes? B. What is the approximate median time people ran the race?

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The table below shows the number of hours students watch TV in one week. Make a histogram of the data. Additional Example 2: Making a Histogram Step 1: Make a frequency table of the data. Be sure to use equal intervals. 6 /// 7 //// //// 8 /// 9 //// 1 // 2 //// 3 //// //// 4 //// / 5 //// /// Number of Hours of TV 13 Frequency Number of Hours of TV 15 46 17 79 17

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Additional Example 2 Continued Step 2: Choose an appropriate scale and interval for the vertical axis. The greatest value on the scale should be at least as great as the greatest frequency. 13 Frequency Number of Hours of TV 15 46 17 79 17 20 16 12 8 4 0

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Additional Example 2 Continued Step 3: Draw a bar graph for each interval. The height of the bar is the frequency for that interval. Bars must touch but not overlap. 13 Frequency Number of Hours of TV 15 46 17 79 17 20 16 12 8 4 0 Because the intervals are equal, all of the bars should have the same width. Caution!

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Additional Example 2 Continued Step 4: Label the axes and give the graph a title. 13 Frequency Number of Hours of TV 15 46 17 79 17 20 16 12 8 4 0 13 46 79 Hours of Television Watched Frequency Hours

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The table shows survey results about the number of household pet(s) students have at home. Make a histogram of the data. Check It Out: Example 2 67896789 1234512345 Number of Pets