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1.What is the average (arithmetic mean) height of the n people in a certain group? DS的题目.
选项
the sum of the heights of the n people is 178 feet 9 inches.
为什么这个选项是不充分的啊? 我觉得这不是大白话嘛..知总数.除一下不就能得平均了么?为什么不充分啊???
2. The table above shows the total sales recorded in July for the 5 salespeople at Acme Truck Sales. It was discovered that one of Cal's sales was incorrectly recorded as one of Ann's sales. After this error was corrected, Ann's total sales were still higher than Cal's total sales, and the median of the 5 sales totals was $330,000. What was the value of the incorrectly recorded sale? table: Ann $450,000 Bob $360,000 Cal $190,000 Dot $210,000 Ed $680,000 答案选的是  120,000 怎么都没搞懂这题什么意思。.大家给解答下吧~` 
The table above shows the total sales recorded in July for the 5 salespeople at Acme Truck Sales. It was discovered that one of Cal's sales was incorrectly recorded as one of Ann's sales. After this error was corrected, Ann's total sales were still higher than Cal's total sales, and the median of the 5 sales totals was $330,000. What was the value of the incorrectly recorded sale? table: Ann $450,000 Bob $360,000 Cal $190,000 Dot $210,000 Ed $680,000 答案选的是 120,000 怎么都没搞懂这题什么意思。.大家给解答下吧~`
3.A hiker walking at a constant rate of 4 miles per hour is passed by a cyclist traveling in the same direction along the same path at a constant rate of 20 miles per hour. The cyclist stops to wait for the hiker 5 minutes after passing her, while the hiker continues to walk at her constant rate. How many minutes must the cyclist wait until the hiker catches up?
(A) 6+2/3 (B) 15 (C) 20 (D) 25 (E) 26+2/3 答案是C. 我奇怪的是骑车的人超过走路的人之后就停下来等走路的人...超过不是一瞬间的事嘛..骑车的人一停.他不就落后于走路的人了么? 最后怎么求走路人追赶骑车人的时间啊? 他们之间的距离怎么算捏? | 
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发表于 2007-12-9 20:10:00
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