Question

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Answer 1

Given:

The box plot of a data set.

To find:

The first quartile of the data.

Solution:

In a box plot, the left end point is the minimum value and the right end point is the maximum value. The left end of the box is the first quartile and right end of the box is third quartile. The line inside the box represents the median.

From the given box plot, it is clear that the left end of the box is at 20.

In the box plot,

Minimum value = 0

First quartile = 20

Median = 40

Third quartile = 90

Maximum = 120

Therefore, the first quartile of the data is 20.