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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?
当前版本由grace859更新于2021-07-28 14:54:13 感谢由grace859对此题目的解答所做出的贡献。
Combined age = 年龄*该年龄总人数
A. 20-year-old males =1.9(读图）*20（年龄）=38
B. 20-year-old females =1.9(读图）*20（年龄）=38
C. 60-year-old males =1.1(读图）*60（年龄）=66
D. 60-year-old females =1.2(读图）*60（年龄）=72
E. 80-year-old females =0.5（读图）*80(年龄）=40
所以正确答案就是D
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