Pictograms, bar charts, pie charts, stem-and-leaf diagrams, frequency polygons and time series, and how a chart can mislead.
What you will learn
- Read and draw pictograms
- Read bar charts and work out pie chart angles
- Read and use a stem-and-leaf diagram
- Draw a frequency polygon
- Describe a trend in a time series
- Say why a chart is misleading
Bar charts
Read each bar against the scale on the vertical axis; first work out what one square is worth (on a scale going 0, 5, 10, each square is 5).
Then answer with the numbers: the total is all the bars added, "how many more" is a subtraction, and one bar as a fraction of the total is bar ÷ total, simplified. Bars of 30, 20 and 10 give a total of 60, and the first is 30/60 = 1/2 of the total.
The rest of this lesson and its 11 practice questions are locked.
In this lesson
- Bar charts
- Pie charts share out 360°
- Pictograms use a key
- Stem-and-leaf diagrams and frequency polygons
- Charts that mislead
- Try it: First question
11 practice questions, marked as you go; about 25 minutes in all.
Key terms
Fraction, Key, Midpoint, Trend
In this unit: Statistics and charts
Averages and range, frequency tables, charts and diagrams, scatter graphs and sampling, and (Higher) cumulative frequency, box plots and histograms.