Chapter 9
9.2: Stem and Leaf Plots
Objective…
Part A: Represent Data in a Stem and Leaf Plot
Why make a stem and leaf plot?
Key reminders!
• Display data in a stem and leaf plot
1)
The data below show the test scores for one student during a
semester. Display the data in a stem and leaf plot.
2)
The data show the math quiz scores for 15 students. Display the
data in a stem and leaf plot.
Part B: Make Conclusions and Solve Problems Involving Stem and Leaf Plots
Chapter 9
9.2: Stem and Leaf Plots
What do stem and leaf plots allow
you to see?
Key Words!
Find the median, mode, and range, and make inferences from a stem
and leaf plot
1)
The data below show the sizes of classes at a school.
•
a. Display data in a stem and leaf plot.
b. How many classes are in the school?
______________
c. What is the range of the class sizes?
______________
d. What is the most common class size?
______________
e. What is the median class size?
______________
f. Find the mean class size.
______________
Chapter 9
9.2: Stem and Leaf Plots
2)
The data below shows the attendance, in number of days, for some
students during the first month of school.
a. Display the data in a stem and leaf plot.
b. How many students are represented by that data? _________
c. What is the most common attendance?
_________
d. What is the mean attendance?
_________
e. What is the median attendance?
_________
Find the median and mean and make inferences from a double stem
and leaf plot
1)
The stem and leaf plot shows the weights, in pounds, of players on
two football teams.
•
b. What is the median weight for
each team?
c. What is the mean wright of each
team?
a. How many players are there on
each team?
d. On average, which team has
heavier players?
Chapter 9
9.2: Stem and Leaf Plots
2)
The stem and leaf plot shows the heights, in inches, of the players
on two football teams.
a. How many players are
on each team?
c. What is the mean
height for each team?
b. What is the median
height for each team?
d. On average, which
team has taller
players?
Compare the median and mean and make inferences from a stem and
leaf plot with outliers
1)
The stem and leaf shows the lengths, in centimeters, of some
salmon caught during a fishing trip.
•
b. Find the mean length of the
salmon.
c. Compare the median and mean.
What can you infer?
d. What is the range of the data?
a.
f.
Find the median length of the
salmon.
e. List the outliers:
Explain how the outliers affect the range of the data. How do these outliers
affect the mean of the data?
Chapter 9
9.2: Stem and Leaf Plots
2)
The weights, in pounds, of some newborn babies at a hospital are
shown in the steam and leaf plot.
a. Find the median weight.
b. Find the mean weight.
c. Compare the median and mean. Explain the differences.
d. What is the range of the data?
e. List the outlier:
f. Explain how the outlier affects the range of the data.
g. How does the outlier affect the mean of the data?