Unformatted text preview: packages, fails to stamp the expiration date once in every 100 packages; Jeff, who stamps 15% of the packages, fails to stamp the expiration date once every 90 packages; and Pat, who stamps 5% of the packages, fails to stamp the expiration date once in every 200 packages. (a) What is the probability that a customer complains that the package of film does not show the expiration date? (b) If a customer complains that her package of film does not show the expiration date, what is the probability that it was inspected by John? Question 8 A class has 10 students, who are ordered according to average grades. How many possible orderings are there? (no ties) Note: Assume that we do not know the average grades of each of the ten people in advance, so many orderings are possible. As an example, suppose those ten people can be labeled as A, B, C, D, E, F, G, H, I and J. Then one possible ordering is BCHAJIGFED....
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 Spring '11
 Qiu
 Expiration date, Order theory, Total order

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