1. Warm Up Problem
Solve for x:
6x + 1 = 37

2. Histograms
Lesson 12-2

3. Objectives
I can construct histograms.
I can analyze histograms.

4. Vocabulary
histogram – a type of bar graph used to display numerical data that have been organized into equal intervals
frequency distribution – how many pieces of data are in each interval

5. Example of a Histogram

6. Example 1
Refer to the histogram. Describe the histogram. How many remote control airplanes cost at least $100? Description: There are 20 total prices recorded. Most airplanes had prices between $25 and $ There were no prices between $125 and $ Total over $100 dollars: = 3 airplanes.

7. Got It?
1. Refer to the histogram. How many airplanes cost less than $75?

8. Example 2
The table show the number of daily visitors to selected state parks. Draw a histogram to represent the data.

9. Example 2 Continued
Step 1: Make a frequency table to organize the data. Use a scale from with an interval of 50.

10. Example 2 Continued
Step 2: Draw and label a horizontal and vertical axis. Include a title. Show the intervals from the frequency table on the horizontal axis. Label the vertical axis to show the frequencies.

11. Yes, this is still Example 2
Step 3: For each interval, draw a bar whose height is given by the frequencies.

12. Got It?
2. The list shows a set of test scores. Choose intervals, make a frequency table, and construct a histogram to represent the data.

13. Homework Hints “Describe the data” means to answer these questions:
What is the total?
What is the mode?
What is the range?