Mathematics, 10.10.2019 02:30 drastipatel18

When an opinion poll calls landline telephone numbers at random, approximately 30% of the numbers are working residential phone numbers. the remainder are either non-residential, non-working, or computer/fax numbers. you watch the random dialing machine make 20 calls. what is the mean number of calls that reach a person? standard deviation?

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When an opinion poll calls landline telephone numbers at random, approximately 30% of the numbers ar...