Dot Plots

Lesson 13.2A - Dot Plots

Dot Plots

1. Sometimes called line plot

2. Shows the frequency of data along a number line

3. a data value is represented by a dot above the corresponding value on the number line

4. the number of dots above each value indicate the frequency of that value
   

Dot Plots

Each dot in a dot plot is a data point plotted along a horizontal axis. Duplicate values are stacked. In this plot, there are 50 data values represented. The value 6 is present 4 times in the set.

Please answer the next three questions

Thank you!

Multiple Choice

What is the highest score in the class?

• 88%

• 100%

• 13

• 98%

Multiple Choice

How many students spent 7 hours doing homework that week?

• 1

• 3

• 5

• 6

Multiple Choice

How many students read no books (zero) last summer?

• 6

• 1

• 4

• 3

Dot Plots

Please answer the next six questions

Thanks again!

Multiple Choice

How many people have 4 or more pets?

• 8

• 3

• 6

• 4

Multiple Choice

How many students scored 93% or less?

• 6

• 16

• 14

• 13

Multiple Choice

How many students scored between 95 and 100?

• 6

• 6

• 9

• 14

Multiple Choice

How many students received a score in the 80's?

• 2

• 10

• 14

• 27

Multiple Choice

What is the greatest amount of time a student spent doing his homework?

• 2 hours

• 1 hour

• 6 hours

• 10 hours

Multiple Choice

How many people have two or less books in their desk?

• 4

• 5

• 6

• 7

Multiple Choice

The dot plot shows the number of people in the vehicles that passed through a security checkpoint in a particular minute.

How many vehicles passed through the security checkpoint?

• 20

• 5

• 21

• 19

Multiple Choice

The dot plot shows the number of people in the vehicles that passed through a security checkpoint in a particular minute.

Find the total number of people who have passed through the security checkpoint in that minute.

• 50

• 56

• 20

• 60

Multiple Choice

The dot plot shows the number of people in the vehicles that passed through a security checkpoint in a particular minute.

What percent of vehicles had more than 3 people?

• 15%

• 80%

• 20%

• 30%

Multiple Choice

The dot plot shows the number of people in the vehicles that passed through a security checkpoint in a particular minute.

Find the mean number of people.

• 3

• 2.8

• 4

• 2

Multiple Choice

The dot plot shows the number of people in the vehicles that passed through a security checkpoint in a particular minute.

Find the median number of people.

• 3

• 2

• 2.5

• 2.8

Building a Dot Plot

Building a dot plot is just a matter of plotting data points on a number line and stacking any duplicates. It's important that your number line be evenly spaced, so it's alright for there to be gaps. Include all numbers even if they aren't represented in the data set.

Building a Dot Plot

Create a number line that will fit all the data and place a dot above the number for each value in the data set.

Choose the dot plot that best matches the data.

Multiple Choice

Open Ended

Briefly describe the distribution of data.

What is one thing that you observe?

Outlier

An extreme value which is much greater or smaller than the rest of the data.

Putting it all together

Math Response

Joseph recorded the daily temperature outside his house at noon for 13 days. the temperatures in F are as follows (see image).

What is the mean temperature?

Type answer here

Correct Answer: 57

Deg^°

Rad

Draw

Look on page 209 of your textbook.

Display the data in Try It #7 in a dot plot.

You won't have room to add 50 to the line so since it is an outlier don't include it.

Start your number line with 54

Open Ended

Briefly describe the distribution of data