Question 528339
An exam consists of 20 true-or-false questions. If a student guesses at every answer, what is the probability that he or she will answer exactly 12 questions correctly? 
----
Binomial Problem with n = 20 and p(correct) = 1/2
---
P(x = 12) = 20C12*(1/2)^12*(1/2)^8 = 0.1201
============
Cheers,
Stan H.
============