Statistics on the fly

 Want a quick summary of area from your dataset within ArcMap?  Use the Statistics option while the attribute table is open.

1) Open your Attribute table if it isn't already open.  Right-click on the theme's name and choose 'open attribute table'.  The attribute table will open. 

2) Right-click on the field in which to calculate statistics. Click on Statistics.

3) A Statistics window will appear outlining a summary of that field.   This is useful when in need of a quick count, a sum, etc.

Things to keep in mind:
    - If there are selected records, the statistics will be based on the selection.
   - You must perform this on a numeric field.