Home /
Expert Answers /
Statistics and Probability /
the-pregnancy-length-in-days-for-a-population-of-new-mothers-can-be-approximated-by-a-normal-distrib-pa573

The pregnancy length in days for a population of new mothers can be approximated by a normal distribution with a mean of 266

days and a standard deviation of 8 days.?

(a) What is the minimum pregnancy length that can be in the top 8?% of pregnancy lengths??

(b) What is the maximum pregnancy length that can be in the bottom 6?% of pregnancy lengths?

The test scores for the analytical writing section of a particular standardized test can be approximated by a normal distribution, as shown in the figure.

?(a) What is the maximum score that can be in the bottom 20?% of scores?

?(b) Between what two values does the middle 60?% of scores lie?

U = 3.8

0=0.86