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bcr123

  • 2 years ago

You have a 5-question multiple-choice test. Each question has four choices. You don’t know any of the answers. What is the experimental probability that you will guess exactly three out of five questions correctly?

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  1. jim_thompson5910
    • 2 years ago
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    this is a binomial distribution problem, so you'll use the formula P(X = k) = (n C k)*(p)^(k)*(1-p)^(n-k) in this case n = 5 p =1/4 = 0.25 k = 3

  2. bcr123
    • 2 years ago
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    i am confused about the X and the C in the equation

  3. jim_thompson5910
    • 2 years ago
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    n C k is the combination formula, so you'll either use a calculator or this formula n C k = (n!)/(k!*(n-k)!)

  4. jim_thompson5910
    • 2 years ago
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    and don't worry about the X

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