Question: Adverse Effects of Lipitor: In a clinical trial of Lipitor (atrovastatian), a common drug used to lower cholesterol, one group of patients was given a treatment of 10mg atrovastatian tablets. That group consist of 19 patients who experienced flu symptoms and 844 patients who did not (based on data from Pfizer, Inc).

(a) Estimate the probability that patient taking the drug will experience flu symptoms.

(b) Is it “unusual” for patients taking the drug to experience flu symptoms?