3. Assume that the number of times that a person suffers from indigestion in a month is a Possion random variable with parameter A = 4. A novel drug has just been marketed that reduces the Poisson parameter to A = 1 for 60 percent of the population. For the other 40 percent of the population, the drug has no appreciable effect on indigestion. If an individual tries the drug for a month and there are two times that he or she suffers from indigestion in this month, how likely is it that the drug is beneficial for him or her