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March 27, 2017

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On a multiple choice test with 10 questions and 5 choices, A,B,C,D,E, for each questions, what are the odds of guessing on all 10 questions and getting 100%. State your answer as a common fraction.
Thanks
-Zach

  • Algebra 1 - ,

    the prob of getting all 5 correct is
    (1/10)*(1/10)*(1/10)*(1/10)*(1/10)
    = (1/10)^5 or
    = 1/100,000
    so the prob of NOT getting all 5 correct
    = 1 - 1/100,000 = 99999/100,000

    so the odds in favour of getting all 5 correct is
    1 : 99,999

  • Algebra 1 - ,

    Thanks
    And I think you answered my question last time i posted, so thanks for keep on rollin'
    :)

  • Algebra 1 - ,

    welcome!

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