What physical property do the following substance have in common: water,oil,mercury,and

At normal "room" temperature, those substances
all exist in the form of liquids.

A statistic is a number that describes groups or samples of objects.

There are two types of statistics. These are descriptive statistic and inferential statistic.

A descriptive statistic is the statistic that describes a sample group.

An inferential statistic is the statistics that are used to draw conclusions about larger groups.