1. 8.) cumulative frequency table
Ch. 12 Vocabulary
5.) frequency
6.) frequency table
7.) histogram
8.) cumulative frequency table

2. 12-2 Frequency and Histograms
Algebra 1

3. Definitions
The frequency of an interval is the number of data values in that interval. A frequency table groups a set of data value into intervals and shows the frequency for each interval. Intervals in frequency tables do NOT overlap, do NOT have any gaps, and are usually of equal size.
How do you chooser intervals? Look at range first, then divide into 4 or 5 intervals.

4. Ex. 1 Make a Frequency Table
1a)Use the data to make a frequency table.
top speeds (mi/h) : 108, 90, 96, 150, 120, 115, 135, 126, 165, 155, , 100
1b) Make a cumulative frequency table.

5. Histograms or Bar graphs
A histogram is a graph that can display data from a frequency table.
Histograms or Bar graphs

6. Describing Histograms
Uniform – The bars are roughly the same height
Symmetric – If a vertical line can divide the histogram into two parts that are close to mirror images.
Skewed – If the histogram has one peak that is NOT in the center.

7. Use the data to make a histogram.
Ex. 2 Draw a histogram
Use the data to make a histogram.
2) ages of relatives: 18, 5, 27, 34, 56, 54, 9, 14, 35, 22, 78, 94, 47, 52, 2, 16, 17, 10

8. Ex. 3 Tell whether the Histogram is uniform, symmetric or skewed for Ex. 2