Probability

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Darby guesses the answers to six questions on the math portion of her college entrance exam. Each question is a true or false question. What is the approximate probability that at least 4 of her answers are correct?

A. 0.23
B. 0.34
C. 0.66
D. 0.78

  • Probability -

    Sorry that the previous response was for 4 correct.
    The number ways to have at least 4 correct is
    (6,4)+(6,5)+(6,6)
    =15+6+1
    =22
    To total number of ways to respond is
    2^6=64
    So the probability is 22/64.

  • Probability -

    What is the probability that at least one of the three people has alzheimer's diseas

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