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

Histograms Lesson 12-2

Objectives  I can construct histograms.  I can analyze histograms.

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

Example of a Histogram

Example 1 – Notes  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.

Example 1 – Guided Practice  Refer to the histogram. How many airplanes cost less than $75?

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

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

Example 2 Continued  Step 2:  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.

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

Example 2 – Guided Practice  The list shows a set of test scores. Choose intervals, make a frequency table, and construct a histogram to represent the data.