Based on a recent study, the pH level of the artesial cord (one vessel in the umbcal cord) is normally distributed with mean 7.31 and standard devaton of 0.18 . Find the percentage of preterm intants who have the folowing arterial cord pH levels. a. ph levels botween 7.00 and 7.50 . b. pH levels over 7.39. Cick here to viou poge 1 of the standard normal distribution table. Clck here to viow poge 2 of the slandard nomal distribution Yable..