Not sure I understand the situation. You say a 102 game league season so that works out to a 34 weeks season, but bowler A has bowled 36 weeks, so 108 games, more than the league.
Usually, leagues will set a minimum game requirement for awards. Some leagues will say 2/3 of the season to qualify. High average would be the highest average computed out to a few decimal places with the minimum requirement met. If there is a tie, then the money would be split.
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