Problem 6.4. According to recent estimates, only 45% of people in Africa have access to safe drinking water, this being the major cause of many waterborne diseases. The incidence rate of waterborne diseases in commu- nities which do not have access to safe drinking water is 88%, whereas in communities which do have access to safe drinking water, this rate is 32%. (a) What is the incidence rate of waterborne diseases in Africa? (b) A patient suffering from a waterborne disease is randomly chosen from a clinic in an African Village. What is the probability that this patient did not have access to safe drinking water