There are some useful figures for average tickets at the end of the Sales Payment Spreadsheet including
Sales Add-on Performance [how often does a sales person include more than one item on a ticket]
Average number of items per ticket Average $'s per ticket
There are some similar figures on the commission report per sales person [even if you don't do commissions]
total # of tickets, average # of items per ticket
Also Cash Register Activity:
Or: Payment Spreadsheet
OR Commissions:
