Please answer question B.

Assume that the duration of human pregnancies can be described by a normal model with mean 267 days and standard deviation 14 days. Complete parts a) through d) below. a) What percentage of pregnancies should last between 265 and 280 days? 38.0 % (Round to one decimal place as needed.) b) At least how many days should the longest 30% of all pregnancies last? P(X2 )= 0.30 (Round to one decimal place as needed.)