Question

the following boxplot shows the typical gas mileage, in miles per gallon, for 20 different car models.
10 20 30 40 50
typical gas mileage (miles per gallon)
based on the boxplot, the top 25 percent of the cars have a typical gas mileage of at least how many miles per gallon?
a 15
b 20
c 25
d 35
e 50

Explanation:

Step1: Recall box - plot properties

In a box - plot, the right - hand edge of the box represents the third quartile ($Q_3$). The third quartile separates the top 25% of the data from the bottom 75% of the data.

Step2: Identify $Q_3$ from the box - plot

Looking at the box - plot, the right - hand edge of the box is at 35.

Answer:

D. 35