Lesson 3E Statistical Displays 529- HISTORY Refer to the stem-and-leaf plot below.
Ages of Signers of Declaration of Independence
Stem Leaf
2 3 4 5 6 7
6 6 9
0 1 3 3 3 4 4 5 5 5 7 7 8 8 9 9
0 0 1 1 1 2 2 2 4 5 5 5 5 6 6 6 6 7 8 9
0 0 0 0 2 2 3 3 5 7
0 0 2 3 5 9
(^0 3) | 1 = 31 years
a. How many people signed the Declaration of Independence?
b. What was the age of the youngest signer?
c. What is the range of the ages of the signers?
d. Based on the data, can you conclude that the majority of the signers
were 30–49 years old? Explain your reasoning.
B 1111 GYMNASTICS The scores for 10 girls in a gymnastics event are 9.3, 10.0,
9.9, 8.9, 8.7, 9.0, 8.7, 8.5, 8.8, and 9.3. Analyze a stem-and-leaf plot of the
data to draw two conclusions about the scores.
- REPTILES The average lengths of certain species Crocodile
Average Lengths (ft)
8.1 16.3 16.3 9.8
16.3 16.3 11.4 6.3
13.6 9.8 19.5 16.0
of crocodiles are given in the table. Analyze a
stem-and-leaf plot of this data to write a
convincing argument about a reasonable length
for a crocodile.- MATH IN THE MEDIA Find a data set in a newspaper or magazine, on
television, or on the Internet that could be represented using a stem-and-
leaf plot. Create a stem-and-leaf plot of the data. Then write a sentence
that summarizes the data. - TENNIS Joel and Skylar displayed some statistics about their favorite
tennis players in the stem-and-leaf plots below. The stem-and-leaf plots
show the number of aces each player had per match in their last
tournament.
Joel’s Player
Number of Aces
Stem Leaf
0
1
2
3
7 8 9
0 1 2 3 5 8
1 4 4 9(^2) | 4 = 24 aces
Skylar’s Player
Number of Aces
Stem Leaf
0
1
2
3
8 9 9
0 3 4 5
1 2 6 7 9
0
(^2) | 6 = 26 aces
a. Which player has a greater range of scores? Explain.
b. Which player should use the mode to emphasize the number of aces?
Explain your reasoning.
c. Based on the data, can you conclude that Skylar’s player is more likely
to average 16 aces in a match? Explain.
Real-World Link
The saltwater
crocodile is the largest
living reptile. Some
measuring 27–30 feet
in length have been
recorded in the wild.
RR
T
513_531_C09_L3_895130.indd 529 1/11/10 9:41 AM