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(Solved): The pregnancy length in days for a population of new mothers can be approximated by a normal distrib ...



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

 



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