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#32

Source: Air Care Colorado 31. Google it: According to a report of the Nielsen Company, 67% of Internet searches in July 2013 used the Google search engine. Assume that a sample of 25 searches is studied. a. What is the probability that exactly 20 of them used Google? b. What is the probability that 15 or fewer used Google? c. What is the probability that more than 20 of them used Google? d. Would it be unusual if fewer than 12 used Google? 32. What should I buy? A study conducted by the Pew Research Center in 2013 reported that 58% of cell phone owners used their phones inside a store for guidance on purchasing decisions. A sample of 15 cell phone owners is studied. a. What is the probability that six or more of them used their phones for guidance on purchasing decisions? b. What is the probability that fewer than ten of them used their phones for guidance on purchasing decisions? c. What is the probability that exactly eight of them used their phones for guidance on purchasing decisions? d. Would it be unusual if more than 12 of them had used their phones for guidance on purchasing decisions? 33. Blood types: The blood type O negative is called the "universal donor" type, because it is the only blood type that may safely be transfused into any person. Therefore, when someone needs a transfusion in an emergency and their blood type cannot be determined, they are given type O negative blood. For this reason, donors with this blood tyne are crucial to blood banks

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