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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.