windows 8 spreadsheet formula

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i need to know how to write a formula , i play 10 pin bowling, and keep track of my weekly scores.

Individual totals, then overall progressive totals, these are what gives the average, the first week was fine, i just took overall total and divided by 3. 

 

but now need to divide by 6 and then 9 and so on,  but dont want to have to count how many games i am up to over the year...

 

hope this is understanable,,thanks

 

 

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