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An airline knows from experience that the distribution of the number of suitcases that get lost each week on a certain route is approximately normal

An airline knows from experience that the distribution of the number of suitcases that get lost each week on a certain route is approximately normal with = 15.5 and = 3.6. What is the probability that during a given week the airline will lose

Less than 20 suitcases?
More than 20 suitcases?
Between 10 and 20 suitcases?

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