1. NOT Instagrams

2.  Histograms are all about groups of numerical data.  Histograms show intervals of data (it kind of looks like a bar graph).  For example, a histogram may show how many people at a Justin Bieber concert were in their teens, twenties, thirties, forties, and fifties.

4.  Example  The boys in Mr. Robinson’s Math class earned the following scores on their last exam: 71, 82, 89, 63, 81, 92, 64, 85, 72, 87.  Here are the steps to creating a histogram:  1. First, we need to figure out what size intervals (or groups) would be appropriate for this data. ◦ We should put our data into groups of: _________________________________________

5.  Make a frequency table that shows how many test scores were in each group. Test Score IntervalsAmount of Tests 60 – 692 70 – 792 80 – 895 90 – 991 71, 82, 89, 63, 81, 92, 64, 85, 72, 87

6.  Next, we will make a graph from our table. Begin by drawing two intersecting lines which create the X and Y axis.  Remember, we will have to label both of these axes with units in a second.

7. 4. Use the left side of your paper to set the range to match your table. Ours is from 1-5. Include units. 5. Then label the bottom of your graph with the test score intervals. Give your graph a title! 6. When you graph your data, the bars must touch!

8.  What is the number of persons below the age of 60 in the histogram below?

9.  If 70 and above is considered a passing grade, how many students passed the math test?

10. Now, see if you can create a histogram of your data! Don’t forget, your histogram must also come with the frequency table!