SOLUTION: a test consists of 15 true/false questions. To pass the test a student must answer at least 12 correct. A) If a student guesses on each question , what is the probability that

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Question 878455: a test consists of 15 true/false questions. To pass the test a student must answer at least 12 correct.
A) If a student guesses on each question , what is the probability that the student will pass the test?
B) Is it unusual for a student to pass by guessing? explain.


I am not sure if this needs to be graphed too?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
p(correct) = .5, n = 15
P(x ≥ 12) = 1 - binomcdf(15, .5, 11) = 1 -.9824 = .0176 0r 1.76% chance of passing
B. YES, very unusual...very little chance statistically of doing so