SOLUTION: A test consists of 10 true/false questions. To pass the test a student must > answer at least 7 questions correctly. If a student guesses on each > question, what is the probabi

Algebra ->  Probability-and-statistics -> SOLUTION: A test consists of 10 true/false questions. To pass the test a student must > answer at least 7 questions correctly. If a student guesses on each > question, what is the probabi      Log On


   



Question 350694: A test consists of 10 true/false questions. To pass the test a student must
> answer at least 7 questions correctly. If a student guesses on each
> question, what is the probability that the student will pass the test?

Answer by jjordan95(63) About Me  (Show Source):
You can put this solution on YOUR website!
There are 2 answer choices, with only 1 being correct. Therefore you have a 50% chance at getting the correct answer. If you need 7/10 of the test correct you can multiply the 50% chance by 7/10.
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%285%2F10%29%2A%287%2F10%29=%2835%2F100%29
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Therefore, you have a 35 percent chance at passing if you guess on all of the questions.