Here's a handy excel file where you can automatically calculate your average and maximum scores.
It's a PivotTable with graphics.
In the tab 'Scores' you need to fill in your score, with your name and date.
In the tab 'Average scores' you can see how match your average score is by date and in total.
In the tab 'Highest scores' you can see your highest score by date and in total.
Download the excel file
