2020 AMC 8 第 14 题

先试着解答 2020 AMC 8 第 14 题,然后核对你的答案与视频与精心整理的解答,解答来自 LIVE by Po-Shen Loh。你也可以参加完整限时模拟考试、查看全部 2020 AMC 8 解答,或核对答案。

所有题目均经美国数学协会(MAA)官方合法授权使用。

14.

牛顿县有 2020 个城市。它们的人口显示在下方条形图中。所有城市的平均人口由水平虚线表示。下列哪一项最接近这 2020 个城市的总人口?
There are 2020 cities in the County of Newton. Their populations are shown in the bar chart below. The average population of all the cities is indicated by the horizontal dashed line. Which of the following is closest to the total population of all 2020 cities?
65,00065{,}000
75,00075{,}000
85,00085{,}000
95,00095{,}000
105,000105{,}000
答案:D
知识点:平均数数据与图表解读
小提示:
虚线略低于 50005000
The dashed line is just under 50005000
大提示:
总人口等于平均人口乘以 2020
Total population = average population times 2020
视频讲解:
解答视频缩略图
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文字解答:
从虚线读出平均人口约为 47504750。
有 2020 个城市,所以总人口约为 20⋅4750=95,000。20\cdot4750=95{,}000\text{。}
因此总人口约为 95,00095{,}000。
正确答案是 D。
Looking at the horizontal dashed line, the average population is around 4750.4750.
Since there are 2020 cities, the total population is approximately 20⋅4750=95,000.20\cdot4750=95{,}000.
Therefore, the total population is approximately 95,000.95{,}000.
Thus, the correct answer is D.
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