How do I get an average for each row

Ok so I think I have a simple report.  I am displaying  sensory or quality data ( like taste, color, etc.) by each product made on a certain day.  All tests have a integer value ( 0 -10 ).  So my details section looks similiar to the below example.... what i want to do is get the average of each row, in the details section.......

Please help....

thanks

doug

productName    date   evaluator     color   taste  smell sweetness  texture            rowAVG

  prodA             4/11/16    doug       5           4      3       4                4                          ?

prodB             4/11/16    doug       5           4      3       6                   7                      ?