SOLUTION: A test consists of 10 true/false questions. To pass the test a student must answer a least 8 questions correctly. If a student guesses on each, question, what is the probability th

Algebra ->  Probability-and-statistics -> SOLUTION: A test consists of 10 true/false questions. To pass the test a student must answer a least 8 questions correctly. If a student guesses on each, question, what is the probability th      Log On


   

Question 1149048: A test consists of 10 true/false questions. To pass the test a student must answer a least 8 questions correctly. If a student guesses on each, question, what is the probability that the student will pass the test?
Answer by greenestamps(13200) About Me  (Show Source):
You can put this solution on YOUR website!


P(10 right) = C%2810%2C10%29%2F2%5E10
P(9 right) = C%2810%2C9%29%2F2%5E10
P(8 right) = c%2810%2C8%29%2F2%5E10

Add those probabilities to get the probability of getting at least 8 right.