How do I create an average collum in my spreadsheet?

[SIRSTEVE]

I just about have my spreadsheet ready to go. But there is one piece to the
puzzle that needs to be fixed. Here's what I need.

I have a spreadsheet with 7 collums in it. The fields are the following:
Date
User Name
Number of request received
Total time
Total time per request

I would like to know how to get a average of the number of request received
times the total of each request.

Thank you in advance for your assistance.