The distance between consecutive flaws on a roll of sheet aluminum is exponentially distributed with mean distance 3 m. Let Xbe the distance, in meters, between flaws.
a. What is the mean number of flaws per meter?
b. What is the probability that a 5 m length of aluminum contains exactly two flaws?
(a) 
(b) Let Y be the of number of ?aws in a ?ve-meter length of aluminum.
Then Y- Poisson(5 ? ),so Y- Poisson(5 ? 3).
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