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Residential numbers in new york city

Telephone marketers and opinion polls use random digit dialing equipment to call residential telephone numbers at random. The polling firm Zogby International reports that just 17% of calls reach a live person. Calls are independent.

A telemarketer places 6 calls. What is the probability (±0.0001) that none of them reaches a person?

Only 6% of calls made to residential numbers in New York City reach a person. What is the probability (±0.0001) that none of 6 calls made to New York City reaches a person?

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## Q : Percent of the executives

The weekly mean income of a group of executives is $998 and the standard deviation of this group is $99. The distribution is normal. What percent of the executives have an income of $908 or less?