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Chapter 6: Q. 2 (page 385)
A normal distribution has a mean of 61 and a standard deviation of 15. What is the median?
The median of the normal distribution will be
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Suppose . What value of is two standard deviations to the right of the mean?
An expert witness for a paternity lawsuit testifies that the length of a pregnancy is normally distributed with a mean of days and a standard deviation of days. An alleged father was out of the country from to days before the birth of the child, so the pregnancy would have been less than days or more than days long if he was the father. The birth was uncomplicated, and the child needed no medical intervention. What is the probability that he was NOT the father? What is the probability that he could be the father? Calculate the localid="1653472319552" -scores first, and then use those to calculate the probability.
What does a z-score measure?
15. Suppose X ~ N(2, 6). What value of x has a z-score of three?
What is the z-score of x= –, if it is standard deviations to the right of the mean?
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