statistics
posted by Kathy .
If a student takes an exam containing 12 true or false questions. If the student guesses what is the probability that he will get exactly 8 questions right?

what is (1/2)^12 * 12!/8!4!
I get about 1/8
posted by Kathy .
If a student takes an exam containing 12 true or false questions. If the student guesses what is the probability that he will get exactly 8 questions right?
what is (1/2)^12 * 12!/8!4!
I get about 1/8