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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 : Point estimate of the population variance

Given the following sample data: 104, 110, 114, 97, 105, 113, 106, 101, 100, 107. Give a point estimate of the population variance s2.