Xiaoxiang and Xiaohong play a game of touching the ball, touch a ball at random, and then put it back. There are 6 red balls, 5 white balls and 2 yellow balls in the bag. It is stipulated that Xiaoxiang will score 1 point for touching the red ball, and Xiaohong will score 1 point for touching the white ball. Each person touches 20 times, and whoever has the highest cumulative score at the end wins. Is this rule fair? If not, how should it be modified to ensure a fair game?
小香和小红做摸球游戏，任意摸一个球，然后放回．袋里有6个红球，5个白球，2个黄球．规定小香摸到红球记1分，小红摸到白球记1分．每人各摸20次，最后累计得分谁高谁赢．这个规则公平吗？如果不公平，应怎样修改才能确保游戏公平？
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