A

**statistical question** is one where there is

**variability** in the answers to the question.

Numeric data from a statistical question can be displayed in a

**line plot**.

A line plot is a data display, along a number line, which shows frequency.

The frequency is represented with a marker, like an

**x** or a dot.

**Mean**, **median**, and **range** can be used to analyze data in a line plot.

- The
**mean**, or average, of a data set is the sum of the values in the data set divided by the number of values in the data set.
- The
**median** is the middle value in an ordered data set.
- The
**range** is the difference between the greatest and least values in a data set.

First, find the sum of the values in the data set.

There are thirteen 8-inch skillets, seven 9-inch skillets, ten 10-inch skillets, and ten 12-inch skillets.

13(8 in.) + 7(9 in.) + 10(10 in.) + 10(12 in.) | = | 104 in. + 63 in. + 100 in. + 120 in. |

| = | 387 in. |

Then, divide the sum by the number of values shown in the graph, 40.

So, the mean diameter of the skillets is 9.675 inches.