what is the average (arithmetic mean) height of the n people in a certain group?
(1) the average height of the n/3 tallest people n the group is 6 feet 2.5inches ,and the average height of the rest of the people n the group is f feet 10 inches
(2) the sum of the heights of the n people is 178 feet 9 inches.
我还没开始做prep 看了这题后也觉得好纳闷~和你有相同的问题！！ 然后copy了你的问题上网查一下，我发现的原题都是说： What is the average (arithmetic mean) height of the n people in a certain group?
1) The average height of the (n/3) tallest people in the group is 6 feet (2 1/2) inches and the average height of the rest of the people in the group is 5 feet 10 inches;
2) The sum of the height of the n people is 178 feet 9 inches.
lz 是你看错了么？应该不是f吧.....
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发表于 2013-11-10 19:49:05
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