Chapter 2.1, Problem 3E

To determine

To explain: about the ${\text{85}}^{\text{th}}$ percentile of vehicle speeds

Answer to Problem 3E

It is meant that $85\%$ of California vehicle speeds on those stretches of road arewithin the speed limits.

Explanation of Solution

Given:

Speed limits are set at the ${\text{85}}^{\text{th}}$ percentile of vehicle speeds.

Typically, the speed limit is set to the speed that separates the bottom $85\%$ of vehicle speedsfrom the top $15\%$ . That is, $85\%$ of California vehicle speeds on those stretches of road arewithin the speed limits.