http://www.ck12.org Chapter 7. Organizing and Displaying Data
Now that the graph has been constructed, there is a great deal of information that can be learned from it.
The number of values in the leaf column should equal the number of data values that were given in the table. The
value that appears the most often in the same leaf row is the trailing digit of the mode of the data set. The mode of
this data set is 35. For 7 of the 20 days, the number of animals receiving treatment was between 34 and 39. The
veterinarian school treated a minimum of 5 animals and a maximum of 60 animals on any one day. The median of
the data can be quickly calculated by using the values in the leaf column to locate the value in the middle position.
In this stem and leaf plot, the median is the mean of the sum of the numbers represented by the 10thand the 11th
leaves:^35 + 235 =^702 =35.
Practice
- The following stem-and-leaf plot shows the cholesterol levels of a random number of students. These values
range from 2.3 to 8.9. What percentage of the students have levels between 5.0 and 7.1, inclusive?
a. 6 %
b. 20%
c. 24%
d. 28%- Just like Presidents of the United States, Canadian Prime Ministers must be sworn into office. The following
data represents the ages of 22 Canadian Prime Ministers when they were sworn into office. Construct a stem-