Rubella During the last 13 years in the United States, there were 138 cases of rubella. a.

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Rubella During the last 13 years in the United States, there were 138 cases of rubella.

a. Find the mean number of cases of rubella per year. Round the result to four decimal places.

b. Find the probability of no cases of rubella in a year.

c. Find the probability of exactly 9 cases of rubella in a year. How does it compare to the 2¨years among 13 that had exactly 9 cases of rubella?

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Biostatistics For The Biological And Health Sciences

ISBN: 9780134039015

2nd Edition

Authors: Marc Triola, Mario Triola, Jason Roy

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