Public Health and Nutrition As of February 16, 2013, the risk of contracting the flu in the United States was still elevated. However, the number of new cases was decreasing. The following table lists the proportion of reported cases of influenza A by region since September 30, 2012.
Suppose a reported case is selected at random.
a. What is the probability that the case is from Region 1, 2, 3, or 4?
b. What is the probability that the case is from Region 9 or 10?
c. What is the probability that the case is not from Region 5?