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Posted by on Wednesday, August 10, 2011 at 9:30am.

The probability that a person has an unlisted telephone number is 0.15. The district manager of
a political action group is phoning people urging them to vote. In a district with 416 households, all households have phones. What is the probability that the district manger will find that:

(a) between 40 and 80 have unlisted numbers?

  • STATISTICS HELP!!!!!!! - , Wednesday, August 10, 2011 at 10:07am

    mean (most probable number) =0.15*416 = 62.4
    sigma = sqrt(0.15*0.85*416) = 7.28
    P (40 to 80) = 99.1%

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