http://www.ck12.org Chapter 7. Organizing and Displaying Data
Note that there are no leaves for the second stem. If there are no values in a class, do not enter a value in the leaf−just
leave it blank.
As for 3 facts that you know about the growth of the plants, answers will vary, but the following are some possible
responses:
- From the stem-and-leaf plot, the growth of the plants ranged from a minimum of 10 cm to a maximum of 61
cm. - The median of the data set is the value in the 13thposition, which is 41 cm.
- There was no growth recorded in the class of 20 cm, so there is no number in the leaf row.
- The data set is multimodal.
Example C
The following stem-and-leaf plot represents the ages of 23 people waiting in line at Tim Horton’s. What is the mode
and the median of the ages? How many people are older than 32?
The mode is the value that appears the most often, and here it is 32. As for the median, since there are 23 data values,
the median is the value that appears in the 12thposition. From the stem-and-leaf plot, it’s clear that this value is 32,
so the median of the data set is 32 as well. Finally, to find the number of people older than 32, count the number of
all the digits after the number 2 in the row that has 3 as its stem. There are a total of 11 digits, so 11 people are older
than 32.