# Lesson 4

Dot Plots

Let's investigate what dot plots and bar graphs can tell us.

### Problem 1

Clare recorded the amounts of time spent doing homework, in hours per week, by students in sixth, eighth, and tenth grades. She made a dot plot of the data for each grade and provided the following summary.

• Students in sixth grade tend to spend less time on homework than students in eighth and tenth grades.
• The homework times for the tenth-grade students are more alike than the homework times for the eighth-grade students.

Use Clare's summary to match each dot plot to the correct grade (sixth, eighth, or tenth).

### Problem 2

Mai played 10 basketball games. She recorded the number of points she scored and made a dot plot. Mai said that she scored between 8 and 14 points in most of the 10 games, but one game was exceptional. During that game she scored more than double her typical score of 9 points. Use the number line to make a dot plot that fits the description Mai gave.

### Problem 3

A movie theater is showing three different movies. The dot plots represent the ages of the people who were at the Saturday afternoon showing of each of these movies.

1. $$3.727 + 1.384$$
2. $$3.727 - 1.384$$
3. $$5.01 \boldcdot 4.8$$
4. $$5.01 \div 4.8$$