What is the shortest braking distance of a sedan that can be in the top 10% of

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What is the shortest braking distance of a sedan that can be in the top 10% of braking distances?
On a dry surface, the braking distances (in feet), from 60 miles per hour to a complete stop, of a sedan can be approximated by a normal distribution, as shown in the figure at the left.
Braking Distance of a Sedan
What is the shortest braking distance of a sedan that
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