How many does it take to screw in a light bulb?的中文意思

题目

How many does it take to screw in a light bulb?的中文意思
书上给出的这个问题的答案是：who knows; you can't draw up a decision matrix in the dark.
为了便于大家回答，我把这个问题的上下文完整地提供如下：
You probably have heard all the jokes about decision theorists who cannot make wise choices.(How many does it take to screw in a light bulb?Who knows; you can't draw up a decision matrix in the dark.What do you call a decision theorist with a bank balance?A meal ticket.)

答案

明白了.是讽刺空谈家
需要多少个这种空谈的决策家来上个灯泡呢?天知道.黑暗中他们可没有办法在那边画决策矩阵来做决定怎么上这个灯泡.
讽刺他们纸上谈兵,却无真正本领.
叫有银行存款的空谈的决策家为饭票.因为他们虽然无半点其他用处,但起码让某些人（比如说银行职员）可以赖以生活.