1. Frequency Histograms and Polygons
© ORB Education Quality Teaching Resources

2. CONSTRUCTING GRAPHS FDT
A Frequency Distribution Table (FDT) is used to organise raw data.
Score
Tally
Frequency 2 3 4 5 6 7 11 8 9 10 1 12
Total 50
A pair of dice was rolled 50 times and the sum recorded.
Construct a frequency distribution table. 7 10 12 8 9 6 5 3 4 11 2
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3. CONSTRUCTING GRAPHS Frequency Histogram 50 Total 1 12 11 4 10 8 9 7 6
Construct a frequency histogram to illustrate the data. 50
Total 1 12 11 4 10 8 9 7 6 5 2 3
Frequency
Tally
Score 3 1 2 4 5 6 7 8 9 10 11 12
Sum of Dice
Frequency
Rolling Dice

4. CONSTRUCTING GRAPHS Histogram Features
Features of a Frequency Histogram
Heading
Sum of Dice 3 1 2 4 5 6 7 8 9 10 11 12
Frequency
Rolling Dice
Appropriate labelling of axes
No gaps between columns
Labels
Columns all the same width
Half column gap here

5. CONSTRUCTING GRAPHS Frequency Polygon Rolling Dice
Construct a frequency polygon to illustrate the data.
This is usually drawn on top of a Frequency Histogram 3 1 2 4 5 6 7 8 9 10 11 12
Sum of Dice
Frequency
Rolling Dice
Now join each dot starting at the ‘origin’
This line should join the x-axis at the next marker
Place a dot at the top of each column (in the centre)