hw help (math)?

When taking a 20 question multiple choice test, where each question has 4 possible answers, it would be unusual to get ___ Incorrect or more questions correct by guessing alone.

Update:

When taking a 20 question multiple choice test, where each question has 4 possible answers, it would be unusual to get___ or more questions correct by guessing alone.

3 Answers

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  • 3 weeks ago

    Depends on what you mean by "unusual."

    There's about a 61.7% chance of getting at most 5 correct. So there's about a 38.3% chance of getting more than 5 correct.

    Does 38.3% qualify as "unusual?" If you roll a die, is it "unusual" if you roll a 5 or 6? It probably won't happen, but it's not that unlikely, so I wouldn't call it "unusual." But the term is subjective, so there is no correct answer.

  • 3 weeks ago

    please reframe. I want to help but I do not understand what you are trying to say.

  • david
    Lv 7
    3 weeks ago

    5 .... 1/4 X 20 = 5 correct by guessing

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