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Data from a major commuter route in Seattle, Washington indicates that the average time to get from a specific area in the suburbs to downtown

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Data from a major commuter route in Seattle, Washington indicates that the average time to get from a specific area in the suburbs to downtown Seattle is 18 minutes with a standard deviation of 3 minutes. Assume the times are normally distributed. If you take this route, how often would you arrive within 20 minutes

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