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Posted by on Wednesday, November 9, 2011 at 4:22am.

Find the probability of correctly answering the first 4 questions on a multiple choice test if random guesses are made and each question has 5 possible answers.

Explain to me the answer?

  • PROBABILITY MATH - , Wednesday, November 9, 2011 at 8:03am

    The prob of answering a question right (R) is 1/5, and the prob of answering it wrong (W) is 4/5
    So you want the specific order of
    RRRRW which would be (1/5)^4 (4/5) = 4/3125

  • PROBABILITY MATH - , Wednesday, November 9, 2011 at 1:21pm

    I don't think it requires for it to be times by (4/5)

    it is just asking for possibility of it being correct 4 times the first times..

    so the answer is 1/625

    :)

    thank you reiny

  • PROBABILITY MATH - , Monday, February 16, 2015 at 10:46pm

    A researcher whishes to estimate the proportion of college students who cheat on exams.

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