SOLUTION: a study conducted revealed that 5% of those who visit a mall spend more than 4 hours there. if 1000 people are randomly selected from those who visit malls find the probability tha

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Question 1014748: a study conducted revealed that 5% of those who visit a mall spend more than 4 hours there. if 1000 people are randomly selected from those who visit malls find the probability that at least 60 or more of them spend more than 4 hours there. If 1000 people are randomly selected from those who visit malls find the probability that at least 60 or more of them spend more than 4 hours there
Answer by robertb(5830) About Me  (Show Source):
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The exact expression giving the probability is sum%28C%281000%2Cx%29%280.05%5Ex%29%280.95%5E%281000-x%29%29%2Cx=60%2C+1000+%29, which makes use of the binomial distribution with p = 0.05, q = 1 - 0.05 = 0.95, and n = 1000.