The length of human pregnancies are normally distributed wit

The length of human pregnancies are normally distributed with = 266 days and = 16 days. What is the area under the curve between x = 230 and x = 260.    Answer in the ten-thousandths.

Solution

Z1=230-266/(16)=-2.25

P(Z1)=0.012

Z2=260-266/(16)=-0.37

P(Z2)=0.355

0.3434-0.012=0.3434