Warm Up Problem Solve for x:

6x + 1 = 37

HistogramsLesson 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 $49.99. There were no prices between $125 and $124.99. Total over $100 dollars: 2 + 1 = 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: Make a frequency table to organize the

data. Use a scale from 100-399 with an interval of 50.

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.

Yes, this is still Example 2 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.