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

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Histograms Lesson 12-2

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Objectives I can construct histograms. I can analyze histograms.

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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

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Example of a Histogram

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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.

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

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

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Example 2 Continued Step 1: Step 1: Make a frequency table to organize the data. Use a scale from 100-399 with an interval of 50.

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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.

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

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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.

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