2. 外语
  3. The incomplete table above shows a distribution of scores for a class of 25 students. If the average (arithmetic mean) score for

The incomplete table above shows a distribution of scores for a class of 25 students. If the average (arithmetic mean) score for

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问题 The incomplete table above shows a distribution of scores for a class of 25 students. If the average (arithmetic mean) score for the class is 83, what score is missing from the table?
选项 A、75
B、77
C、81
D、84
E、86
答案A
解析 If the average score for the class is 83, then the sum of all 25 students’ scores be 83×25=2,075. The sum of the scores for the 22 students for whom we have scores is 368+546+581+355=1,850. So the three students’ scores must make up the difference between 2,075 and 1,850; 2,075-1,850=225; 225/3=75.
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