2. Main Idea and New Vocabulary Example 1: Construct a Histogram
Example 2: Analyze and Interpret Histograms
Example 3: Analyze and Interpret Histograms
Lesson Menu

3. Display and analyze data in a histogram.
Main Idea/Vocabulary

4. Construct a Histogram
FOOD The list below shows the number of milligrams of caffeine in certain types of tea. Use intervals 1–20, 21–40, 41–60, 61–80, and 81–100 to make a frequency table. Then construct a histogram.
Example 1

5. Construct a Histogram
The least value in the data is 0 and the greatest is 8. An interval size of 20 milligrams would yield the frequency table below.
Example 1

6. To construct a histogram follow these steps.
Step 1 Draw and label a horizontal and vertical axis. Include a title.
Step 2 Show the intervals from the frequency table on the horizontal axis.
Step 3 For each interval, draw a bar whose height is given by its frequency.
Example 1

7. Construct a Histogram Answer:
Because all of the intervals are equal, all of the bars have the same width.
There is no space between bars.
Example 1

8. Cory made a frequency table to show the number of ants he found on his porch each day. Which histogram correctly displays this data. A. B. C. D.
Example 1 CYP

9. Analyze and Interpret Histograms
WEATHER How many months had six or more days of rain?
Three months had 6 to 7 days of rain and 1 month had 8 to 9 days of rain.
Answer: Therefore, or 4 months had six or more days of rain.
Example 2

10. How many bracelets have five or more beads?
A. 4 bracelets
B. 5 bracelets
C. 8 bracelets
D. 17 bracelets
Example 2 CYP

11. Analyze and Interpret Histograms
WEATHER What percent of the months had 3 days of rain or less?
There were or 12 months in all. There were or 7 months that had 3 days of rain or less.
Example 3

12. Analyze and Interpret Histograms
Divide 7 by 12.
Answer: So, about 58% of the months had 3 days of rain or less.
Example 3

13. What percent of the bracelets had 6 beads or less?
Example 3 CYP