gwd 6 2 平均問題

Kath1985 · 发表于 2011-6-7 16:29:07

6-Q2:

If every car sold last week at a certain used-car dealership was either a coupe or a sedan, what was the average (arithmetic mean) sale price for all the cars that were sold at the dealership last week?

(1)The average sale price for the sedans that were sold at the dealership last week was $10,600.

(2)The average sale price for the coupes that were sold at the dealership last week was $8,400.
我的思維如下請問對不對?
設a,b為couper和sedans賣出的個數;c和s為couper和sedans的售價=> (ac+bs)/(a+b)
根據條件1=> bs/b=10600, s=10600 不充分
根據條件2=> ac/a=8400, c=8400 不充分
結合=> ( a*8400+b*10600)/(a+b) 由於無法得知個數所以不充分答案為E

白菜白菜 · 发表于 2012-8-8 23:50:58

嗯嗯是的权数不知道所以不能得出答案~

gwd 6 2 平均問題

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