Frequency Tables and Stem-and-Leaf Plots

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Frequency Tables and Stem-and-Leaf Plots

Learn to organize and interpret data in frequency tables and stem-and-leaf plots.

Course 2

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Frequency Tables and Stem-and-Leaf Plots

Vocabulary

frequency table cumulative frequency stem-and-leaf plot

Course 2

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Frequency Tables and Stem-and-Leaf Plots

A frequency table is a way to organize data into categories or groups.

By including a cumulative frequency column in your table, you can keep a running total of the frequencies in each category.

Course 2

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Frequency Tables and Stem-and-Leaf Plots

Additional Example 1: Organizing Data in a Frequency Table

The list shows the average high temperatures for 20 cities on one February day. Make a cumulative frequency table of the data.

69, 66, 65, 51, 50, 50, 44, 41, 38, 32, 32, 28, 20, 18, 12, 8, 8, 4, 2, 2

Step 1: Look at the range to choose equal intervals for the data.

February Temperatures in 20 Cities

Average Highs

Frequency Cumulative Frequency

0?19

20?39

40?59

60?79

Course 2

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Frequency Tables and Stem-and-Leaf Plots

Additional Example 1 Continued

The list shows the average high temperatures for 20 cities on one February day. Make a cumulative frequency table of the data.

69, 66, 65, 51, 50, 50, 44, 41, 38, 32, 32, 28, 20, 18, 12, 8, 8, 4, 2, 2

Step 2: Find the number of data values in each interval. Write these numbers in the "Frequency"

February Temperatures in 20 Cities

Average Highs

Frequency Cumulative Frequency

0?19

7

20?39

5

40?59

5

column.

60?79

3

Course 2

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