是 15/90 啊.
因?yàn)?是在90個(gè)里面有15個(gè)藍(lán)盤子,簡單一比就好啊.
如果是你的答案,那你沒有考慮盤子的總數(shù).如果總數(shù)是100個(gè),你的答案還是這樣,但是實(shí)際上應(yīng)該是15/100.想想也知道比例會(huì)小.
請(qǐng)問這一道很簡單的sat數(shù)學(xué)題
請(qǐng)問這一道很簡單的sat數(shù)學(xué)題
A clerk accidentally threw a valuable document into one of 90 trash cans.It is equally likely that the document is in any of these 90trash cans.If exactly 15 of these 90 trash cans are blue,what is the probability that the document will be in a blue trash can?
我覺得答案是1/15但是參考答案是1/6
為什么呢
A clerk accidentally threw a valuable document into one of 90 trash cans.It is equally likely that the document is in any of these 90trash cans.If exactly 15 of these 90 trash cans are blue,what is the probability that the document will be in a blue trash can?
我覺得答案是1/15但是參考答案是1/6
為什么呢
英語人氣：876 ℃時(shí)間：2020-06-06 06:14:50
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