2015 AMC 8 第 5 题

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所有题目均经美国数学协会(MAA)官方合法授权使用。

5.

Billy 的篮球队在赛季前 1111 场比赛中的得分如下:

42424747535353535858585858586161646465657373

如果他的球队在第 1212 场比赛中得到 4040 分,下列哪一个统计量会增加?

Billy's basketball team scored the following points over the course of the first 1111 games of the season:

42,42, 47,47, 53,53, 53,53, 58,58, 58,58, 58,58, 61,61, 64,64, 65,65, 73.73.

If his team scores 4040 in the 1212th game, which of the following statistics will show an increase?

range\text{range}

median\text{median}

mean\text{mean}

mode\text{mode}

midrange

mid-range

答案:A
知识点:极差
难度评级:770
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文字解答:

考虑全部 1212 场比赛时,第 1212 场得到的 4040 分会成为最低分。因此,与前 1111 场的极差相比,全部 1212 场的极差从 7342=3173-42 = 31 增加到 7340=3373-40=33

所以正确答案是 A

When considering all 1212 games, 4040, from the 1212th game, will be the lowest score. Therefore, compared to the range of just the first 1111 games, the range of all 1212 games would increase from 7342=3173-42 = 31 to 7340=33.73-40=33.

Thus, the correct answer is A .

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