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Each runner in a race was from one of three countries: $$A$$, $$B$$, or $$C$$. The number of runners from Country $$A$$ was 2 times the number of runners from Country $$B$$, and the number of runners from Country $$C$$ was 3 times the number of runners from Country $$A$$. The average (arithmetic mean) finishing times of the runners from countries $$A$$, $$B$$, and $$C$$ were 81 minutes, 84 minutes, and 90 minutes, respectively. What was the average finishing time of all the runners in the race?
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· 相关考点
5.2.1 平均值
5.2.1 平均值
以上解析由 考满分老师提供。
