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Cholesterol Reducing Drug - The probability of flu symptoms for a person not receiving any treatment is 0

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Cholesterol Reducing Drug - The probability of flu symptoms for a person not receiving any treatment is 0.019. In a clinical trial of lipitor, a common drug used to lower cholesterol, 863 patients were given a treatment of 10-mg atorvastatin tablets, and 19 of those patients experienced flu symptoms (based on data from Pfizer, inc) Assuming these tablets have no effect on flu symptoms, estimate the probability that at least 19 of 863 people experience flu symptoms. What do these results suggest about flu symptoms as an adverse reaction to the drug?