Dot Diagram

Question 1

What is a dot diagram?

Answer 1

It is made up of a horizontal line and dots that are placed above the line. The dots represent the values in the data.

Question 2

What is the first step to create a dot diagram based on the data provided

Answer 2

First draw a horizontal line and label the values.

As the smallest hours spent is 0 and highest is 7, label from 0 to 7.

Question 3

What is the second step to create a dot diagram based on the data provided

Answer 3

Add the dots for each time a value appears.

Question 4

How many students are involved in the survey?

Answer 4

16

you can either count the number of dots or

you can add the frequency

Question 5

How do we identify the most frequent data?

Answer 5

We look at the value that has the most dots

In this case, 2 hours is the value

Question 6

How do we calculate the total number of hours all the students spent?

Answer 6

we have 2 students who spent 0 hours, 2 * 0 = 0

we have 2 students who spent 1 hours, 2 * 1 = 2

we have 6 students who spent 2 hours, 6 * 2 = 12

we have 3 students who spent 3 hours, 3 * 3 = 9

we have 2 students who spent 4 hours, 2 * 4 = 8

we have 1 student who spent 7 hours, 1 * 7 = 7

So we add all, 0 + 2 + 12 + 9 + 8 + 7 = 38 hrs

Question 7

How many people were involved in the survey?

Answer 7

24

Question 8

How many students bought 4 books?

Answer 8

3

Question 9

What is the most common number of books bought?

Answer 9

5 and 7

both have 5 persons

Question 10

What is the most number of books bought?

Answer 10

9

1 person bought 9 books

Question 11

What is the total number of books bought?

Answer 11

3 * 0 + 1 * 2 + 2 * 2 + 3 * 4 +

5 * 5 + 2 * 6 + 5 * 7 + 1 * 8 + 1 * 9

= 0 + 2 + 4 + 12 + 25 + 12 + 35 + 8 + 9

= 107