Exam (129).pdf - Question A company installs new central-heating furnaces and has found that for 15 of all installations a return visit is needed to

Exam (129).pdf - Question A company installs new...

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Question: A company installs new central-heating furnaces and has found that for 15% of all installations, a return visit is needed to make some modifications. Six installations were made in a particular week. Assume independence of outcomes for these installations. a. What is the probability that a return visit will be needed in all these cases? b. What is the probability that a return visit will be needed in none of these cases? c. What is the probability that a return visit will be needed in more than 1 of these cases? Answer : The number of installations in a particular week, The percentage of installations for which a return visit needed to make modifications is, Here, number of trials is fixed and the probability of success is known. So, apply binomial distribution.
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  • Summer '16
  • boer
  • Probability, Probability theory, Cumulative distribution function, Discrete probability distribution, number of installations

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