A box plot is a very efficient way of displaying key pieces of information.

Box plots display the median, upper quartile, lower quartile, range and the interquartile range.

Notice how all the information mentioned can be obtained from looking at where the points of interest intersect the x-axis.

Constructing a box plot:

You may be asked to draw a box plot from information given to you. 

For example: Draw a box plot given the shortest person in survey is 141cm, and the tallest person is 182cm. The median height is 165cm, the lower quartile is 158cm and the upper quartile is 172cm. 

We have all the information we need to plot a box plot, see the diagram below to see what it looks like.

 

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Follow the links below to see how this topic has appeared in past exam papers

 

AQA Unit 1 March 2011 (H) - Page 11, Question 8(b)

AQA Unit 1 November 2011 (H) - Page 8, Question 6

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