A new medical test has been developed by a laboratory to test flu virus. The research group claimed that if an individual is infected by the virus, the probability that the test result is positive is 0.95; if the individual is not infected, the probability that the test result is negative is 0.9. Suppose we know that the proportion of infection in the population is about 0.08. (a) (3 points) If 100 individuals are selected from the population, what is the average number got infected