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In 1980 the total population of females from 50 to 59 years old, inclusive, was closest to The "combined age" of a group of peo
In 1980 the total population of females from 50 to 59 years old, inclusive, was closest to The "combined age" of a group of peo
admin
2009-05-19
10
问题
In 1980 the total population of females from 50 to 59 years old, inclusive, was closest to
The "combined age" of a group of people is the sum of the ages of all of the people in the group. Which of the following groups had the greatest combined age in 1986?
选项
A、20-year-old males
B、20-year-old females
C、60-year-old males
D、60-year-old females
E、80-year-old females
答案
D
解析
一群人的总年龄是这群人中所有人的年龄和。在1986年,下面哪群人的总年龄最大?
解:本题的正确答案为(D)。从图中找出每群人的人数,然后再乘以他们的人数,最后再比较大小。由图可知:20岁的男性和女性人数均约为2.2 million,因而这两群人的总年龄约为44 million岁;60岁男性约为1.1 million,因而总年龄为66 million岁;60岁女性约为1.2 million,因而总年龄为72 million岁;而80岁女性约为0.5 million,总年龄为40 million岁。综上所述60岁女性的总年龄最大。
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