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anonymous

  • 5 years ago

i need help with a probability question

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  1. anonymous
    • 5 years ago
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    I can probably help you

  2. anonymous
    • 5 years ago
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    can you post ?

  3. anonymous
    • 5 years ago
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    oh your typing it. sry didnt see.

  4. anonymous
    • 5 years ago
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    my question is a test consists of 20 tru/false question to pass a student must answer 18 corectly .. if a student guesses on each question, what is the probability that the student will pass the test ?

  5. anonymous
    • 5 years ago
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    I think 40%

  6. anonymous
    • 5 years ago
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    Very close to zero, give me a minute to get the exact answer

  7. anonymous
    • 5 years ago
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    It is definitely not 40%. Much lower

  8. anonymous
    • 5 years ago
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    can you tell me like how to get the answer

  9. anonymous
    • 5 years ago
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    it would help me alot

  10. anonymous
    • 5 years ago
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    probably. I totally forgot this subject.

  11. anonymous
    • 5 years ago
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    So...try getting the probability of one correct answer. True or false. That is 50%

  12. anonymous
    • 5 years ago
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    If you guess on a tru/false, thats 50 percent for each answer.

  13. anonymous
    • 5 years ago
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    so you use that and 20 get your percentage then subtract 2 I think...

  14. anonymous
    • 5 years ago
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    Now try two answers correct. He has to guess 50% correctly twice. To answer two correct questions he has to get 50% twice

  15. anonymous
    • 5 years ago
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    To answer 18 correct he's have to be some kind of superhero

  16. anonymous
    • 5 years ago
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    so it will be like .50*.50 ?

  17. anonymous
    • 5 years ago
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    Dude this is really hard to think right now i'm totally stoned out of my mind

  18. anonymous
    • 5 years ago
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    .50*.50 18 times ?

  19. anonymous
    • 5 years ago
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    maybe its like .50 times 18

  20. anonymous
    • 5 years ago
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    maybe its like .5^18

  21. anonymous
    • 5 years ago
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    OH NO NOW I REMEMBER

  22. anonymous
    • 5 years ago
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    what you have to do it find the probability of him NOT getting 18. And subtract that from 100%

  23. anonymous
    • 5 years ago
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    So in order to not get 18 correct he has to get three incorrect am i right?

  24. anonymous
    • 5 years ago
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    yea

  25. anonymous
    • 5 years ago
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    how do you find the probability of getting three incorrect?

  26. anonymous
    • 5 years ago
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    do you know any good way to get blood out of my keyboard? Its gotten to the point where its just nasty

  27. anonymous
    • 5 years ago
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    ? what does that have 2 wid anething ?

  28. anonymous
    • 5 years ago
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    dude i don't know i'm just trying to help you maybe you could help me too

  29. anonymous
    • 5 years ago
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    get alcohol pads probably

  30. anonymous
    • 5 years ago
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    that actually sounds like a good idea actually has this worked for you in the past?

  31. anonymous
    • 5 years ago
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    dude just like find the prob. of getting three wrong then subtract. its very easy

  32. anonymous
    • 5 years ago
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    R u talkin bout my errors?

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