The length of human gestation is well-approximated by a normal distri- bution with mean u = 280 days and standard deviation o = 8.5 days. Suppose Mary has a driving test scheduled for June 20 and she has a due date of June 28. (i) Find the probability she will give birth on or before the day of the driving test. (ii) Find the probability she will give birth in June sometime after the driving test. (iii) Mary decides to move the driving test to an earlier date so that there will be a 98% chance that she will give birth afterward. What date should she pick?
Can you please explain where you get every single figure because I am confused about where the 272, 273, and 282 days come from?
Which formula's are to be used?
How do I understand this question?