VARIABILITY

4-4

WARM-UPS

Find the range and first and third quartile.

1.  15, 83, 75, 12, 19, 74, 21

2.  75, 61, 88, 79, 79, 99, 63, 77

Variability describes how spread out the data is.

Range of a data set is the largest value minus the smallest value.

Quartiles divide the data into four equal parts.

Box-and-Whisker Plots show the distribution of the data.

Find the range and the first and third quartiles for each data set.

a.  85, 92, 78, 88, 90, 88, 89

b.  14, 12, 15, 17, 15, 16, 17, 18, 15, 19, 20, 17

Use the given data to make a box-and-whisker plot.

a.  21, 25, 15, 13, 17, 19, 19, 21