Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability and its Z score. Insert data into equation below to solve for score (length).
Z = (score-mean)/SD
the pregnancy length in days for a population of new mothers can be approximated by a normal distribution with a mean of 270 days and a standard deviation of 12 days.
a. what is the minimum pregnancy length that can be in the top 11% of pregnancy lengths?
b. What is the maximum pregnancy length that can be in the bottom 6% of pregnancy lengths?
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