Simple summaries of centre and spread

Centre
The median is the simplest measure of centre. Half the data values are more than it, and half less.
Spread
The range (maximum - minimum) and interquartile range (upper quartile - lower quartile) are two different summary statistics that describe the spread of values in a data set.

Information from median and interquartile range

Given the median and interquartile range, it is possible to sketch a bell-shaped histogram that matches these values. Such a 'guess' is often close to the actual distribution of values.