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3.22: Stem and Leaf Plots, Range of a Data Set

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Remember Julie? Have you ever wondered how to calculate range?

Well, here is the stem - and- leaf plot that Julie created in the last Concept.

This Concept is all about how you can use a stem - and - leaf plot to determine the range of a set of data. Pay attention and by the end of the Concept you will know how Julie can figure out the range of the data.

Guidance

In the last Concept, you learned how to create a stem - and - leaf plot for a set of data. Once you have the stem - and - leaf plot made, you can use it to figure out the range of a set of data.

What is the range?

The range is the difference between the maximum score and the minimum score.

The smallest number in the stem-and-leaf plot is 22. You can see that by looking at the first stem and the first leaf. The greatest number is the last stem and the last leaf on the chart. In this case, the largest number is 55. To find the range, we subtract the smallest number from the largest number. This difference will give us the range.

55 - 22 = 33

The range is 33 for this set of data.

Look at the following stem-and-leaf plot and answer these questions.

Example A

What is the range for this data set?

Solution: 35

Example B

What is the smallest interval?

Solution: 12 - 14

Example C

What is the greatest interval?

Solution: 42 - 47

Now back to Julie and the stem - and - leaf plot. Here it is once again.

What is the range of Julie's data?

To figure this out, we can find the difference between the greatest value in the data set and the smallest value in the data set.

86 - 52 = 34

The range of the data is 34.

Vocabulary

Here are the vocabulary words in this Concept.

Stem-and-leaf plot
a way of organizing numbers in a data set from least to greatest using place value to organize.
Data
information that has been collected to represent real life information
Ascending
from smallest to largest
Descending
from largest to smallest
Interval
a specific period or arrangement of data
Range
the difference from the largest value to the smallest value

Guided Practice

Here is one for you to try on your own.

What is the range of this data set?

To figure this out, we find the difference between the largest value in the data set and the smallest value in the data set.

The largest value is 68.

The smallest value is 33.

68 - 33 = 35

The range of the data set is 35.

Video Review

Here are videos for review.

Khan Academy Stem-and-Leaf Plots

Great video on organizing, building and interpreting a stem and leaf plot.

http://www.mathplayground.com/howto_stemleaf.html

Practice

Directions: Use each stem - and - leaf plot to answer the following questions.

Stem Leaf
6 8
7 5 7 9
8 0 2
9 2 6 6 7

1. What is the smallest value in the plot?

2. What is the greatest value in the plot?

3. What is the range of the data?

Stem Leaf
0 8
1 2 7 8 9
2 2 3
3 1 5
4 0

4. What is the smallest value in the data set?

5. What is the greatest value in the data set?

6. What is the range of the data?

7. Name the first interval.

8. Name the second interval.

9. Name the third interval.

10. Name the fourth interval.

11. Which interval has the greatest number of values in it?

12. Which interval has the smallest number of values in it?

13. Because the 4 stem has a zero in it, does that mean that there aren't any values in it?

14. True or false. You can create a stem - and - leaf plot with a range in the hundreds?

15. True or false. You can create a stem - and - leaf plot without using intervals?

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Difficulty Level:

Basic

Grades:

Date Created:

Oct 29, 2012

Last Modified:

Apr 11, 2014
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