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 95%. Click the icon to view a table of areas under the normal curve. (a) The 20th percentile for incubation times is days. (Round to the nearest whole number as needed.)

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