At the US Open Tennis Championship a Statistician Keeps Track of Every

question 33

Multiple Choice

At the U.S. Open Tennis Championship a statistician keeps track of every serve that a player hits during the tournament. The statistician reported that the mean serve speed of a particular player was 104 miles per hour (mph) and the standard deviation of the serve speeds was 11 mph. If nothing is known about the shape of the distribution, give an interval that will contain the speeds of at least three-fourths of the player's serves.

• A) 82 mph to 126 mph
• B) 93 mph to 115 mph
• C) 71 mph to 137 mph
• D) 126 mph to 148 mph

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Definitions:

Trailer Parking Brakes

A braking system designed specifically for trailers to prevent them from rolling when parked or during hitching and unhitching operations.

5th Wheel Locks

Mechanical devices designed to secure the fifth wheel coupling on a tractor-trailer, preventing unauthorized detachment of the trailer.

Bowed Upper Coupler

A condition in semi-trailers where the front upper plate, which connects to the tractor, is bent or curved, potentially affecting connection and safety.

High Hitch

A potentially dangerous tractor-to-trailer coupling condition in which the fifth wheel locking mechanism engages but the trailer kingpin sits on top of the jaws.