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

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Presentation transcript:

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 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.

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

Example 2 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.

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.

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