if 200 calls, find prob. that 150 or more have ans. machine

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flyingfreedom

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Aug 6, 2008
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According to a research company survey, 70% of telephone subscribers have an answering machine. If a telemarketing campaign contacts 200 telephone subscribers, what is the probability that 150 or more will have an answering machine?

how does one go about solving that?
 
flyingfreedom said:
the reason I'm asking the question is because....
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..."is because" of what? Are you saying that you missed the last week or two of class, and haven't been able to figure out the material from your textbook or from the class notes you've gotten from a friend, so you're needing lessons over this topic?

Eliz.
 
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