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Visa Card USA studied how frequently young consumers, ages 18 to 24, use plastic (debit and credit) cards in making purchases (Associated Press,...

Visa Card USA studied how frequently young consumers, ages 18 to 24, use plastic (debit and credit) cards in making purchases (Associated Press, January 16, 2006). The results of the study provided the following probabilities.

The probability that a consumer uses a plastic card when making a purchase is .37.
Given that the consumer uses a plastic card, there is a .19 probability that the consumer is 18 to 24 years old.
Given that the consumer uses a plastic card, there is a .81 probability that the consumer is more than 24 years old.
U.S. Census Bureau data show that 14% of the consumer population is 18 to 24 years old.

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