multiple choice guessing probability (1 Viewer)

[kuromusha]

There are 240 questions, there are three choices in each question.

What is probability of guessing at least 168 questions correctly?

 

[InteGrand]

There are 240 questions, there are three choices in each question.

What is probability of guessing at least 168 questions correctly?

 

[InteGrand]

Realised you probably just want a numerical answer lol.

According to http://www.wolframalpha.com/widgets/view.jsp?id=78baf4f3a070cc5b9b226664d2ce80ec and http://wolframalpha.com/input/?i=su...240+choose+k)(1/3)^(k)+*(2/3)^(240-k)&x=0&y=0 , the probability you're after is on the order of 10^(-31).

So basically '0'.

 

[kuromusha]

you're pretty good at LaTeX

 

[leehuan]

InteGrand is completely used to LaTeX. But there's no need to learn it when you can simply http://s1.daumcdn.net/editor/fp/service_nc/pencil/Pencil_chromestore.html