As Andy explains it to me, it's not the average PA, but:

3 / (1/PA1+1/PA2+1/PA3)

So, if you had 3 guys, 10 PA, 100 PA, 1000 PA, the "Average" would be 27.

3 / (1/PA1+1/PA2+1/PA3)

So, if you had 3 guys, 10 PA, 100 PA, 1000 PA, the "Average" would be 27.

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