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Probabilities from frequency tables

Probabilities from frequency tables problem 8

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Parker, being the manager of a company, is served a cup of coffee by her secretary every morning. For some days, Parker counted all the teacups used to serve him coffee, noting their colours and size.

	Small	Medium
Green	4	2
Yellow	2	3

If a cup is chosen at random, what is the probability that it is yellow and a medium size?

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