15 businesses are sent mailings asking them to answer survey questions and send the mailing back. The probability of response is 45%. What is the probability that greater than 6 businesses will respond? What is the probability that between 4 and 10 businesses will respond? What number of surveys would you have to send out if you wanted to be able to expect to get 9 back?
Added by Curtis S.
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Probability that greater than 6 businesses will respond: We can use the binomial distribution formula to calculate this probability: P(X > 6) = 1 - P(X ≤ 6) where X is the number of businesses that respond. Using the binomial distribution formula, we get: P(X > 6) Show more…
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