Chapter 1.2, Problem 54E

(a)

To determine

To explain: the description of the dot above -3 .

Answer to Problem 54E

Dot -3 describes one car whose EPA mileage in city is more than highway

Explanation of Solution

Given information:

A graph is given as follows

  

Calculation:

Dot plot is a type of simple representation of histogram which is used when small data values appear where values fall into number discrete categories in statistics

The number of dots in the above graph gives the number of cars with difference in EPA mileage raring out of 24 cars

Dot above -3 describes one car whose EPA mileage in city is more than highway

(b)

To determine

To describe: the graph that shows about fuel economy

Answer to Problem 54E

Fuel economy on the highway is far better in the city for such cars as 23 of the 24 cars have better mileages on this highway

Explanation of Solution

Calculation:

From the graph given it is evident that approximately $99\%$ have mileage in the highway more than the city

Thus, fuel economy on the highway is far better in the city for such cars as 23 of the 24 cars have better mileages on this highway