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Conditional probability

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The table below shows the drink preferences for people in 3 different age groups. If one of the 255 subjects is randomly chosen, what is the probability that the person drinks cola given they are over 40? Round your answer to 3 decimal places.

Water Orange juice Cola
Under 21 years 40 25 20
21 - 40 years 35 20 30
Over 40 years 20 30 35

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