Question

the box - and - whisker plot below represents some data set. what is the value of the first quartile?

Explanation:

Step1: Recall the definition of the first quartile in a box - and - whisker plot

In a box - and - whisker plot, the first quartile ($Q_1$) is the left - hand edge of the box.

Step2: Locate the left - hand edge of the box on the number line

Looking at the number line, each tick mark represents a value. The left - hand edge of the box is at 45.

Answer:

45