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Don't know how to represent the data as a box plot.

I'm going through an S1 paper, and I'm meant to represent the data from a stem and leaf diagram (which shows the test scores of 19 employees) in the form of a box plot.

I know the basic shape of a box plot:



But how do I draw it if the upper quartile is the same as the maximum value?

The test was out of 40, and 5 people received full marks... so the upper quartile and highest value are identical.

I'm not very good at maths :cry2: Does anybody know how to do it?

It's from the January 2010 exam, if that's any help.
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gdunne42
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Original post by Liam_G
I'm going through an S1 paper, and I'm meant to represent the data from a stem and leaf diagram (which shows the test scores of 19 employees) in the form of a box plot.

I know the basic shape of a box plot:



But how do I draw it if the upper quartile is the same as the maximum value?

The test was out of 40, and 5 people received full marks... so the upper quartile and highest value are identical.

I'm not very good at maths :cry2: Does anybody know how to do it?

It's from the January 2010 exam, if that's any help.


Yeap it's a bit unusual but there's just no whisker for the upper quartile
the 3 marks were awarded for the box (Q1,Q2,Q3 values), the outlier and the whisker in Q1.

I know some people who put a big dot on the Q3 line of the box, others who kind of shaded the end of whisker at the edge of Q3 but you didn't have to do anything at all.
(edited 13 years ago)

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