SOLUTION: a) If you make random guesses for 15 multiple choice SAT test questions (each with four possible answers). What is the probability of getting at least one correct? If these questio

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Question 1176768: a) If you make random guesses for 15 multiple choice SAT test questions (each with four possible answers). What is the probability of getting at least one correct? If these questions are part of a practice test and an instructor says you must get at least one correct answer before continuing, is there a good chance you will continue
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!

Hi
 15 multiple choice SAT test questions (each with four possible answers).
 p = .25  n = 15

P(at least one) = 1 - P(x=0) = 1-.0134 = .9866

Practice Test: must get at least one correct answer before continuing
first Question for example:
P(is correct by guessing) = .25
  

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