1. Warm Up
Problem of the Day
Lesson Presentation
Lesson Quizzes

2. Warm Up
Find the median of each data set 9
1. 9, 6, 14, 16, 5, 29, 1
2. 7, 11, 2, 18, 7, 28, 83, 7 9
3. 9.1, 6.4, 4.2, 5.5, 3.3, 6.3
5.9

3. Problem of the Day
The following set shows the ages of the nine incoming U.S. presidents inaugurated during the second half of the 20th century.
62, 43, 55, 46, 61, 52, 69, 67, 46
What is the median age?
55 years old
What is the mode?
46 years old

4. Learn describe and compare data distributions by their center, spread, and shape, using box-and-whisker plots or dot plots.

5. The measures of center may not be equal. are equal.
Recall that a frequency distribution is a display that shows how many times data values fall into categories of quantity. Frequency distributions are categorized by their general shape.
Shapes of a Distribution
Skewed
Normal
Data are not symmetric
about the center.
Data are symmetric
The measures of center
may not be equal.
are equal.

6. Additional Example 1: Displaying Distributions on Dot Plots
A. The data set and dot plot display heart rate data. Describe the shape of the data distribution. 85, 84, 83, 82, 85, 80, 84, 90, 87, 85, 86, 88, 86, 85
The data is symmetrical about the center. It shows a normal shape of distribution.

7. The data is skewed. The mean, median, and mode are varied.
Continued: Example 1
B. The data set and dot plot display students’ quiz scores. Describe the shape of the data distribution. 10, 8, 7, 9, 10, 9, 9, 7, 8, 9, 6, 8
The data is skewed. The mean, median, and mode are varied. 7

8. Check It Out: Example 1
The data set and dot plot display the number of miles Danny ran each day. Describe the shape of the data distribution. 
The data is skewed. The mean, median, and mode are varied.

9. The data is skewed. The mean, median, and mode are varied.
Additional Example 2: Displaying Distributions on Box-and-Whisker Plots
A. The data set and box-and-whisker plot display the weights in kilograms of 12 cats. Describe the shape of the data distribution.
5, 2, 6, 4, 6, 3, 4, 9, 3, 5, 3, 4
The data is skewed. The mean, median, and mode are varied. 9

10. The data is skewed. The mean, median, and mode are varied.
Check It Out: Example 2
The data set and box-and-whisker plot display the number of pets that several students in Ms. Snow’s class own. Describe the shape of the data distribution.
9, 0, 4, 1, 1, 2, 3, 5, 2
The data is skewed. The mean, median, and mode are varied. 10

11. Additional Example 3: Comparing Distributions using Box-and-Whisker Plots
The box-and-whisker plots show the distribution of cars sold each day on two lots in a month. What conclusions can you make about the data?
In general, more cars were sold each day in Lot A than in Lot B. The spread of the data is greater for Lot B, which means that there is more variation in the data. The number of cars sold in Lot A is more predictable than the number of cars sold in Lot B. 11

12. Check It Out: Example 3
The box-and-whisker plots show the distribution of cars sold each day on two lots in a month. What conclusions can you make about the data?
In general, more cars were sold each day in Lot B than in Lot A. The spread of the data is greater for Lot B, which means that there is more variation in the data. The number of cars sold in Lot A is more predictable than the number of cars sold in Lot B. 12

13. Lesson Quizzes
Standard Lesson Quiz
Lesson Quiz for Student Response Systems

14. Lesson Quiz
1. The data set and dot plot display the number of pets
owned by 14 children. Describe the shape of the data distribution.
skewed

15. Continued Lesson Quiz
2. The data set and box-and-whisker plot display the number of seconds it takes 14 sports cars to reach a speed of 60 miles per hour. Describe the shape of the
data distribution.
normal

16. Lesson Quiz For Student Response Systems
1. The dot plot displays the number of pets owned by14 children. Describe the shape of the data distribution.
A. skewed
B. normal

17. Continued: Lesson Quiz for Student Response Systems
2. The box-and-whisker plot displays the number of songs 14 people downloaded per month. Describe the shape of the data distribution.
A. skewed
B. normal 17