Lengths of pregnancies are normally distributed with a mean of 268 days and a standard deviation of

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Lengths of pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days.

a. What is the percentage of pregnancies that last less than 250 days?

b. What is the percentage of pregnancies that last more than 300 days?

c. If a birth is considered premature if the pregnancy lasts less than 238 days, what is the percentage of premature births?

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Statistical Reasoning for Everyday Life

ISBN: 978-0321817624

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Authors: Jeff Bennett, Bill Briggs, Mario F. Triola

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Question Posted: Dec 23, 2015 07:35 AM

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Lengths of pregnancies are normally distributed with a mean of 268 days and a standard deviation of

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a z 250 268 15 120 From Table 51 the percentage lasting less than ...View the full answer

Statistical Reasoning for Everyday Life

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