How do you work out the 9th decile of a graph?

It's in a statistics practise paper, but i dont know what a decile is or how im supposed to work it out. Any help would be appreciated 🙂

a decile is one tenth, you are being asked to mark the point on the graph where 9/10 is below and 1/10th is above
22 June 2011
Thankyou! that makes sense. Is there any charge for using this website? :S
22 June 2011
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