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Chapter 2: Q 5. (page 104)

Setting speed limits According to the Los Angeles Times, speed limits on California highways are set at the 85th percentile of vehicle speeds on those stretches of road. Explain to someone who knows little statistics what that means.

Short Answer

Expert verified

15% of the data is greater than or equal to the data point. The speed limits are established at the speed at which 85 percent of vehicle speeds are below the speed limit.

Step by step solution

01

Part (a) Step 1: Given information

On California highways, vehicle speed limits are established at the 85th percentile for specific lengths of road.

02

Concept

The percentile of an individual is the percentage of the distribution that is less than the data value of the individual.

03

Explanation

The 85th percentile is a data point in which 85 percent of the data is less than or equal to the data point, and 15% of the data is higher than or equal to the data point. On some stretches of road, the speed limits are established at the speed at which 85 percent of vehicle speeds are below the speed limit.

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