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Topic: Phone Directory (Read 346 times) |
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maryl
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There is a town in Texas where 5% of all the people living there have unlisted phone numbers. If you selected 100 names at random from the town's phone directory, on average, how many of these people would have unlisted phone numbers?
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Leo Broukhis
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Re: Phone Directory
« Reply #1 on: Jul 8th, 2003, 2:08pm » |
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Zero, if it is a public phone directory, and 5 if it is a classified phone directory.
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Lupin
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Re: Phone Directory
« Reply #2 on: Jul 15th, 2003, 4:15pm » |
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I know is a "gotcha" but ... people who have unlisted phone numbers may as well also have regular phone numbers and vice-versa
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