bbtomato

CPAbeatsCFA Wrote:
-------------------------------------------------------
> job71188 Wrote:
> --------------------------------------------------
> -----
> > Look at it like this, you only really need to
> know
> > 66 questions, and can blindly guess on the
> other
> > 54 and you will have an expected value of a
> 70.0%.
> > When you think of it like that, only having to
> be
> > certain on 66 out of 120 questions doesn't seem
> so
> > tough.
>
> 84/120 = .7. You need to know 84 questions for
> sure and you can blindly guess on the remaining 36
> to KNOW you will pass. I dont know where you got
> that 66 from...a 66/120 = 55% and is a definate
> fail.

Expected value of a question is 1/3.

Know 66 = 66 marks
Guess 54 = 18 marks

Total = 84/120 = 70%