Unit 5 Contents

Line Plots to Find the Median

Use the Using a Line Plot page in the Student Activity Book to complete Questions 9–11.

Groups 5 and 6 measured their head circumferences using inches instead of centimeters. Mrs. Dewey asked them to record their measurements to the nearest inch. Their data tables are shown below. Mrs. Dewey asked them to show their data using a line plot.

9. Irma's and Nicholas's data is shown on the line plot on the Using a Line Plot page in the Student Activity Book. Add the data for the other members in Group 5 and for all of the students in Group 6.
1. How many students have a head circumference that is less than 23 inches?
2. What is the difference between the number of students with a head circumference of 21 inches and the number of students with a head circumference of 23 or 24 inches?
11. Use the line plot to find the median head circumference for these eight students. Be ready to explain how you found your answer.
12. What strategy could you use to find the mean head circumference for these two groups?
    Explain your answer.