Speeds of automobiles on a certain stretch of freeway at 11:00 PM are normally distributed with mean

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Speeds of automobiles on a certain stretch of freeway at 11:00 PM are normally distributed with mean \(65 \mathrm{mph}\). Twenty percent of the cars are traveling at speeds between 55 and \(65 \mathrm{mph}\). What percentage of the cars are going faster than \(75 \mathrm{mph}\) ?

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