Unit 5 Section 1 : Frequency Tables: Discrete Ungrouped Data

In this section we revise collecting data to produce vertical line graphs or pie charts.

Example

The pupils in Mr. Middleton's class take a Maths test and get scores out of 10, which are listed below:
37625910871
8435678765
3698759678
The pupils are asked to produce a pie chart and a vertical line graph.

Step 1: Produce a frequency table:
This is a table showing the number of times each score appears.
For example, the score "5" appears 4 times, so the frequency of "5" is 4.
You can also use a tally when counting up the frequency of each item.

Step 2: Work out the angles for the pie chart:
There are 360 round a circle, and 30 pupils in the class.
To work out the angle for each pupil, you need to divide 360 by 30.
The angle for 1 pupil is 12.

To work out the angle for a particular score, you need to multiply the number of pupils who got that score by 12.
For example, the angle for the score "5" will be 48 because the frequency of "5" is 4, and 412 = 48.
The workings for this example are shown in the table below:

ScoreFrequency
Angle
1
1
1 12 = 12
2
1
1 12 = 12
3
3
3 12 = 36
4
1
1 12 = 12
5
4
4 12 = 48
6
5
5 12 = 60
7
6
6 12 = 72
8
5
5 12 = 60
9
3
3 12 = 36
10
1
1 12 = 12
Totals
30
360

It's a good idea to check that your angles add up to 360.

Step 3: Draw and label the pie chart:
Start with a circle, and draw a line from the centre to the top.
Then mark off each angle around the circle, and label the "pieces" of the "pie".
Don't forget to give the pie chart a title.
The final result should look like this:

Step 4: Draw the vertical line graph:
In a vertical line graph, the frequency always goes on the vertical axis.
The scores will be on the horizontal axis and there will be one vertical bar for each score.
The height of each score's vertical bar is given by the frequency of that score.
Don't forget to label both axes and give the graph a title.
The final result should look like this:

 

Practice Questions
Work out the answer to each of these questions then click on the button marked Click on this button below to see the correct answer to see whether you are correct.

(a) Use the pie chart to complete this sentence: "Half the class scored more than ____ marks."

(b) Use the bar chart to work out which score occured the most often.

 

Exercises

Work out the answers to the questions below and fill in the boxes. Click on the Click this button to see if you are correct button to find out whether you have answered correctly. If you are right then will appear and you should move on to the next question. If appears then your answer is wrong. Click on to clear your original answer and have another go. If you can't work out the right answer then click on Click on this button to see the correct answer to see the answer.

Question 1
Mr. Rafiq runs a video library. Over a period of 3 days he notes how many
videos have been borrowed during each hour. His records are shown below:
1121334141
2332423232
1134243323
Mr. Rafiq decides to put the data in a table so he can draw a pie chart:
Videos in the hour
Frequency
Pie chart angle
1
2
3
4
Total

(d)What was the largest number of videos hired in any hour?
videos
(e)What was the least number of videos hired in any hour?
videos
(e)What was the most common number of videos hired in any hour?
videos

(a)Use the data above to work out the frequency of each value.
Enter the frequencies in the table, and fill in the total frequency.

(b)Work out the pie chart angles for each value. Enter the
angles in the table, and fill in the total of the angles.

(c)Label the pieces in the pie chart below:
   
 

Question 2
A class of 24 pupils took a maths test. Each obtained a score from 0 to 10.
The pie chart below shows the scores obtained by the class.

 

(a) If 24 pupils took the test, how many degrees represent 1 pupil?
degrees

(b) Fill out the table below to show the frequencies for each score:
ScoreFrequencyCheck Answer
0
1
2
3
4
5
6
7
8
9
10

 

When you want to draw lines on a vertical line diagram in the questions below, click where you want the top of the line to be. If you want to change the height of the line, click at a different height on the same line. If you want to remove a line, click the square at the top of the line. You can practise this on the vertical line diagram in Question 3.
You may find it helpful to have some paper to do tally charts for some of these questions.

Question 3
The National Curriculum levels reached by a Key Stage 3 maths class were:
65645645445664
64554564366655

(a) Use the data to complete the vertical line diagram below.

(b) Which level was obtained by the most pupils?

 

Question 4
Below are the National Curriculum levels for English for the same class as in Question 3:
6453434 6546556
4645554 5536444

(a) Use the data to complete the vertical line diagram below.

(b) Which subject did this class generally do better in?

 

Question 5
A calculator was used to produce 40 random digits. They are listed below:
7210546911
9921035975
5410939346
6780123872

(a) Fill in the vertical line diagram below to illustrate this data.

(b) Which digit occured the least number of times?

 

Question 6
A train company keeps a record of how many trains are late each day.
The data for January and February are shown in the table below:
January
February
10273124
51247430
14132123
4560129
5144243
6833635
5744454
4356894
(a) Use the data above to complete the vertical line diagrams below for January and February:

(b) In which month was a better service provided to passengers?

(c) How many days had 7 or more trains late (over both months together)?


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Produced by A.J. Reynolds May 2003
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