Chapter SR34, Problem 18P

Solution

Use the box-and-whisker plot to answer exercise.

What is the upper quartile of songs on Sam’s CDs?

16.5

Given:

The given box-and-whisker plot.

  

Concept used:

• Write the data in order from least to greatest. Ordered data are divided into a lower half and an upper half by the median. The median of the lower half is the lower quartile, and the median of the upper half is the upper quartile.

Calculation:

The given box-and-whisker plot is -

  

Write the data in order from least to greatest.

10 11 12 13 14 15 16 17 18

The median is 14.

The median of the upper half is the upper quartile.

So upper quartile is (16+17)/2=33/2=16.5

So the upper quartile of songs on Sam’s CDs is 16.5