2. The mean incubation time of fertilized chicken eggs kept in an incubator is 22.8 days. Suppose that the incubation times are normally distributed, and the standard deviation is 1.2 days. (4 pts) a. What is the 33rd percentile for incubation times of chicken eggs? (2 pts) b. Determine the two incubation times that mark off the middle (center) 95% of fertilized chicken eggs. (2 pts)