Unlisted numbers a telemarketing firm in a large city uses


Question: Unlisted numbers A telemarketing firm in a large city uses a device that dials residential telephone numbers in that city at random. Of the first 100 numbers dialed, 48% are unlisted. This is not surprising because 52% of all residential phones in the city are unlisted.

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Basic Statistics: Unlisted numbers a telemarketing firm in a large city uses
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