1 The mean incubation time of fertilized chicken eggs kept at 100.5.F in a still- air incubator is 21 days, with standard deviation of 1 day. Find the probability that a randomly selected egg takes over 22 days to hatch. of the trier The scores earned on the math portion of the SAT are normally distributed with a mean 516 and standard deviation of 116. What scores separate the middle 90% of the test takers from the bottom and top 5%