The following frequency distribution provides a certain condition prevalence frequency distribution for 55 regions. Condition (%) a. Determine the number of outcomes (regions) that constitute the event (not C). Event (not C) has regions. Frequency 4- under 5 9 5-under 6 10 6-under 7 18 7- under 8 10 8- under 9 5 9-under 10 2 10- under 11 1 A = event that has a prevalence of at least 8% B = event that has a prevalence of less than 7% C = event that has a prevalence of at least 5% but less than 10% D = event that has a prevalence of less than 9%