The lengths of human pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. What is the probability that a pregnancy lasts at least 300 days?
A) 0.4834
B) 0.0179
C) 0.0166
D) 0.9834

Question

Quizplus · Accepted Answer

To find the probability that a pregnancy lasts at least 300 days, we calculate the z-score: (300 - 268) / 15 = 2.13. Using the standard normal distribution table, the probability of a z-score greater than 2.13 is approximately 0.0166.

The Lengths of Human Pregnancies Are Normally Distributed with a Mean