Concept explainers
The article “Three Sisters Give Birth on the Same Day” (Chance, Spring 2001, 23–25) used the fact that three Utah sisters had all given birth on March 11, 1998 as a basis for posing some interesting questions regarding birth coincidences.
a. Disregarding leap year and assuming that the other 365 days are equally likely, what is the
b. With the assumptions used in part (a), what is the probability that three randomly selected births all occur on the same day?
c. The author suggested that, based on extensive data, the length of gestation (time between conception and birth) could be modeled as having a normal distribution with
d. Explain how you would use the information in part (c) to calculate the probability of a common birth date.
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Chapter 4 Solutions
Probability and Statistics for Engineering and the Sciences
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