There are 20 questions on a multiple choice exam, each with four possible answers. If a student guesses on all twenty questions, what is the probability the student gets two questions correct? Express your answer as a percent rounded to the nearest tenth.

16.9%

6.7%

4.7%

18.7%

@mathmate

Question

There are 20 questions on a multiple choice exam, each with four possible answers. If a student guesses on all twenty questions, what is the probability the student gets two questions correct? Express your answer as a percent rounded to the nearest tenth.
 

 





 
 
  
16.9% 


 




 
 
  
6.7% 


 




 
 
  
4.7% 


 




 
 
  
18.7% 
 
@mathmate

anonymous · Answer

I just need the chances of getting it right and wrong

mathmate · Answer

what is the probability of guessing an answer right out of four choices?

anonymous · Answer

yes

anonymous · Answer

@mathmate

mathmate · Answer

I repeat:
What is the probability of guessing an answer right out of four choices?

anonymous · Answer

I don't know, that's what I was asking

anonymous · Answer

.2 ?

anonymous · Answer

@mathmate

mathmate · Answer

How did you get 0.2?

anonymous · Answer

I divided 4 by 20.. I think I got the  answer though, is it 18.7 ?

mathmate · Answer

There are 20 questions on a multiple choice exam, $ each\  with\  four\  possible\  answers.$
is the key to the answer you're looking for.
"each" means "each question".