单选题If 70% of the bananas in a particular harvest had an average (arithmetic mean) length of 7 inches and 30% of the bananas in that harvest had an average (arithmetic mean) length of 5 inches, what was the average (arithmetic mean) length, in inches, of all of the bananas in the harvest?A6.0B6.2C6.4D6.6E6.8
单选题
If 70% of the bananas in a particular harvest had an average (arithmetic mean) length of 7 inches and 30% of the bananas in that harvest had an average (arithmetic mean) length of 5 inches, what was the average (arithmetic mean) length, in inches, of all of the bananas in the harvest?
A
6.0
B
6.2
C
6.4
D
6.6
E
6.8
参考解析
解析：
假设共有100个香蕉，根据题干全部香蕉的长度为(100×70%×7)+(100×30%×5)=640英尺，共有100只香蕉，所以平均每只香蕉的长度为640/100=6.4。故选C。
假设共有100个香蕉，根据题干全部香蕉的长度为(100×70%×7)+(100×30%×5)=640英尺，共有100只香蕉，所以平均每只香蕉的长度为640/100=6.4。故选C。
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