藍皮 335 求助！

14. The president of a consulting firm analyzed the decisions made about marketing by her clients and concluded that the decisions were correct only about half of the time.
The conclusion above depends on the presupposition that
(A) companies can be successful even when about half of the decisions they make about marketing prove to be wrong
(B) companies hiring her consulting firm make no more incorrect marketing decisions than do companies in general
(C) executives consistently making correct marketing decisions rarely enlist the aid of a consulting firm
(D) marketing decision are just as likely to be correct as they are to be incorrect
(E) it is possible to classify a marketing decision properly as being either right or wrong

本來選的D，OA是E

不懂。

half of the time 是什麽意思啊？

我认为（D）的意思是说一个公司做出的错误决定和正确决定的次数差不多，对半分。 此句有点客观事实的意思

而（e）是说一个决定的正确与否在每个人的眼里不同，有人认为该决定对有人认为不对

题目是说顾问公司总裁认为他的客户里，几乎一半的人做出的自以为正确的决策，在该顾问公司总裁眼里是错误的

謝謝了哈~

了解了。是總體平均數和個體概率的關係。沒看懂題...