This link takes you to a lesson produced by the CDC (Centers for Disease Control and Prevention) on summarising quantitative data. It is part of a self-study course in epidemiology.
The lesson walks you through the different ways of summarising data using descriptive statistics, tables, and graphs. It shows when each is most appropriate. For example when is a mean an appropriate summary? When is a histogram an appropriate summary? When is an interquartile range an appropriate summary?