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a 10 question multiple choice test has 4 possible answer for each question. A student selects at least 6 correct answers.

Find probability of this event:

(multiple choice)
A) .118
B) .995
C) .068
D) .571

  • Math -

    he got 6 right, 4 wrong. The question has no answer. Did he randomly guess, or did he know the answers to only six?
    If he knew the answers to six, the probability is 1 that he gets those six.
    If he knows 5, the prob is 1 he gets those right, plus pr =4(1/4)(3/4) he gets one more or a pr of .75 he gets six right knowing 5, guessing on the last four.

    Well, we need to know how many he knew, I think.

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