In: Statistics and Probability
Data from the national vital statistics system reveal that the distibution of the duration of human pregnancies is approximately normal with a mean of 270 days and a standard deviation of 17 days
Which of the following statements are true
A. The area under the curve to the left of z= -1.53 is .0630
b. A z-score = 0.25 can be interpreted as a 25% probability that a pregnancy will last 274 days or longer
c. Approximately 14.46% of all pregnancies have a duration less than 252 days
d. the z-score for a pregnancy that has a duration of 275 days(9 months) is 0.29
e. The area under the curve to the left of a z-score = -0.10 is approximately 10%
f. Approximately 98% of all pregnancies have a duration longer than 236 days
g. The z-score for a pregnancy that has a duration of 300 days is 1.76
h. The area under the curve to the right of a z-score = 0.70 is 0.7580