I don't know the answer in letter B i need help. Thank you!

1. 2. 41 The mean incubation time of fertilized eggs is 22 days. Suppose the incubation times are approximately normally distributed with a standard deviation of 1 day (a) Determine the 20th percentile for incubation times, (b) Determine the incubation times that make up the middle 97%. Click the icon to view a table of areas under the normal curve. (a) The 20th percentile for incubation times is 21 days. (Round to the nearest whole number as needed.) (b) The incubation times that make up the middle 97% are to days (Round to the nearest whole number as needed. Use ascending order.)