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Online chat rooms are dominated by the young. Teens are the biggest users. If we look...

Online chat rooms are dominated by the young. Teens are the biggest users. If we look only at adult internet users (aged 18 and over) 47% of the 18 to 29 age group chat, as do 21% of the 30 to 49 age group and just 7% of those 50 and over. The distribution of age break down for these internet users is: 30% of the adult internet users are 18 to 29, another 50% are 30 to 49 and the remaining 20% are 50 and over. What percentage of adult chat room participants are aged 50 and over?

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Answer #1

P(adult chat room participants) = 0.3 * 0.47 + 0.5 * 0.21 + 0.2 * 0.07 = 0.26

P(aged 50 and over | adult room chat participants) = 0.2 * 0.07 / 0.26 = 0.0538 = 5.38%

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