1. Suppose that the three inspectors at a film factory are supposed
to stamp the expiration data on each package of film at the end of
assembly line. John , who stamps 25% of the packages, fails to stamp
the expiration date once in every 200 packages, Tom , who stamps
60% of the 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 in every 90 packages. If a customer complains that
her package does not show the expiration date, what is the probability
that was inspected by John?
2.Ten people are randomly seated at round table. What is the prob
ability that a particular couple will seat next to each other?
3.
The life span in hours of an electrical component is a random
variable with cumulative distribution function
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 Spring '08
 Staff
 Statistics, Probability, Probability theory, Expiration date

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