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anonymous

  • one year ago

A multiple choice quiz has five questions. Each question has four answer choices. If you guess every answer, what is the probability of getting at least three correct?

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  1. anonymous
    • one year ago
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    well, to start you would want to find the fractions of each probability

  2. anonymous
    • one year ago
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    Each question has four answers, so 1/4, times the amount of questions 1/5 gives you 1/20

  3. anonymous
    • one year ago
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    so the probability would be 1/20 or 5% ?

  4. anonymous
    • one year ago
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    not quite, we have to figure out the probability for getting at least 3 questions out of 5 right

  5. anonymous
    • one year ago
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    yes

  6. anonymous
    • one year ago
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    so you need at least three right, so (1/5)3

  7. anonymous
    • one year ago
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    ^3

  8. anonymous
    • one year ago
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    ohhhh

  9. anonymous
    • one year ago
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    i got .008

  10. anonymous
    • one year ago
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    wait i may be wrong

  11. anonymous
    • one year ago
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    you would do 1/4 * 1/4 * 1/4 * 1/4 * 1/4

  12. anonymous
    • one year ago
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    9.765 E^-4 that what i got

  13. anonymous
    • one year ago
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    is there another step or something?

  14. anonymous
    • one year ago
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    nope, im pretty sure thats the answer, but check it just to make sure.

  15. anonymous
    • one year ago
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    i the 9.765 E^-4 a probability ?

  16. anonymous
    • one year ago
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    *is

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