ok so the question is 30% of workers take public transportation. In a sample of 10 workers what is the probability that at least three will take public transportation daily.
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The setting appears to be binomial. Therefore, sum the binomial probability theorem (where n is the number of trials, k is the number of successes, and p is the probability of success) for k = 3, k = 4, ..., k = 9, and k = 10, or .
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