Suppose that the lengths of human pregnancies are normally distributed with a mean of 265 days and a standard deviation of 16 days. Complete the following statements.
A) Approximately _____ pregnancies have lengths between 217 days and 313 days.
A) 68%
B) 75%
C) 95%
D) 99.7%

B) Approximately 68% of pregnancies have lengths between _____ days and _____ days.