The mean human gestation period is 266 days. Actual time to delivery is approximately normally distributed with a standard deviation of about 12 days. Marcelle goes into labor and gives birth to a child 245 days after conception. What percentage of women give birth (a) At the same point in pregnancy as or earlier than Marcelle.\
(b) At a later point in pregnancy than Marcelle.
(c) Between their due date and the point at which Marcelle gave birth?