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Learning Math Home
Session 2, Part C: Frequency Tables
 
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Session 2, Part C:
Frequency Tables

In This Part: Making a Table | Cumulative Frequencies | Another Method
Intervals and Ranges

Here is another way that you could use either the line plot or the frequency table to obtain the cumulative frequencies. Look at the number of boxes with 25 or fewer raisins, which are highlighted in red on both the line plot and the frequency table:

interval dot plot  

Raisin Count

Frequency

25

1

26

2

27

3

28

5

29

4

30

1

31

1

There is one box with 25 or fewer raisins.

Now look at the number of boxes with 26 or fewer raisins, highlighted in green on the line plot and the frequency table:

interval dot plot  

Raisin Count

Frequency

25

1

26

2

27

3

28

5

29

4

30

1

31

1

There are three boxes with 26 or fewer raisins.

Problem C7

  

You can add a third column to the table to indicate cumulative frewquencies. Use the line plot or the frequency table to complete the cumulative frequency values.

Raisin Count

Frequency

Cumulative Frequency

25

1

1

26

2

3

27

3

28

5

29

4

30

1

31

1

show answers

 

Raisin Count

Frequency

Cumulative Frequency

25

1

1

26

2

3

27

3

6

28

5

11

29

4

15

30

1

16

31

1

17


hide answers


Stop!  Do the above problem before you proceed.  Use the tip text to help you solve the problem if you get stuck.
A quicker way to find the cumulative frequency is to add the previous cumulative frequency to the frequency of the new value. So for 28 or fewer, add the previous cumulative frequency (6) to the frequency of the new value (5) to get the new cumulative frequency (11).    Close Tip

Next > Part C (Continued): Intervals and Ranges

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