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Probability Question

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  1. The Smoking Pimp The Smoking Pimp is offline

    United States

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    Jan 25th, 2012 (1/25/2012 3:02am)

    Trying to help nephew with his math homework and came across this problem. If you roll an eight sided dice and your friend rolls a four sided dice, what are the odds that you will roll a higher number than your friend. The answer i got was 68.75%. Can any of you geeks tell me if this is right?
  2. DaVols DaVols is offline

    Wilmington, DE
    United States

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    Jan 25th, 2012 (1/25/2012 3:07am) in reply to The Smoking Pimp

    ok well look at it like this, 32 total possibilities (4 for him times 8 for you)

    If you roll a 5,6,7,8 you're going to be higher (thats 16)
    If you roll a 4, you beat 3 of his rolls (19)
    Roll a 3, you beat 2 of his (21)
    Roll a 2, you beat 1 of his (22)

    22/36, whatever that comes out to be is your answer
  3. warden warden is offline

    Tucson, AZ
    United States

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    Jan 25th, 2012 (1/25/2012 3:09am) in reply to DaVols

    i think davols mistyped the 36 and means 32 (as he said, that's total possibilities)

    22/32 = 68.75%
     2
  4. The Smoking Pimp The Smoking Pimp is offline

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    Jan 25th, 2012 (1/25/2012 3:10am) in reply to warden

    Ahh ok thanks guys I was surprisingly right it appears
    Thread Starter
  5. iLLNuGWichee iLLNuGWichee is offline

    Avon, IN
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    Jan 25th, 2012 (1/25/2012 3:10am) in reply to The Smoking Pimp

    22/32*

    OP was right
     
  6. t4a2n0kk t4a2n0kk is offline

    Ankeny, IA
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    Jan 25th, 2012 (1/25/2012 3:14am) in reply to The Smoking Pimp

    outcomes in the negative are:

    him: 4, 3, 2
    you: 3,2,1; 2,1; 1.

    .25*.125+.25*.125+.25*.125+.25*.125+.25*.125+.25*. 125

    1 - above = .8125
  7. warden warden is offline

    Tucson, AZ
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    Jan 25th, 2012 (1/25/2012 3:29am) in reply to t4a2n0kk

     
    Originally Posted by t4a2n0kk View Post

    outcomes in the negative are:

    him: 4, 3, 2
    you: 3,2,1; 2,1; 1.

    .25*.125+.25*.125+.25*.125+.25*.125+.25*.125+.25*. 125

    1 - above = .8125

    you're not taking into account times when the dice roll the same number

    don't know why you'd bother trying to do it that way when it's so straightforward
    Edited By: warden Jan 25th, 2012 at 05:56 AM
     2
  8. phish42O phish42O is offline

    Houston, TX
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    Jan 25th, 2012 (1/25/2012 4:29am) in reply to warden

    It's 50-50.
    Edited By: phish42O Jan 25th, 2012 at 04:30 AM
  9. setherson2 setherson2 is offline

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    Jan 25th, 2012 (1/25/2012 5:20am) in reply to phish42O

    Mad misuse of dice and die itt
    124 1
  10. AmSlim22 AmSlim22 is offline

    Port Jefferson, NY
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    Jan 25th, 2012 (1/25/2012 5:38am) in reply to setherson2

     
    Originally Posted by setherson2 View Post

    Mad misuse of dice and die itt

    glad he isnt helping with vocabulary homework.
     
  11. OldGrowth OldGrowth is offline

    Woodinville, WA
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    Jan 25th, 2012 (1/25/2012 5:41am) in reply to The Smoking Pimp

     
    Originally Posted by The Smoking Pimp View Post

    Trying to help nephew with his math homework and came across this problem. If you roll an eight sided dice and your friend rolls a four sided dice, what are the odds that you will roll a higher number than your friend. The answer i got was 68.75%. Can any of you geeks tell me if this is right?

    So..you're not really trying to help him with his homework....You are actually DOING IT for him. Hows your (er, his) science project coming along? You going with the erupting volcano again?
  12. saxton82 saxton82 is offline

    Houston, TX
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    Jan 25th, 2012 (1/25/2012 5:50am) in reply to OldGrowth

     
    Originally Posted by OldGrowth View Post

    So..you're not really trying to help him with his homework....You are actually DOING IT for him. Hows your (er, his) science project coming along? You going with the erupting volcano again?


    reminds me of Modern Family a few weeks ago with the egg drop
  13. elusively elusively is offline

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    Jan 25th, 2012 (1/25/2012 6:37am) in reply to phish42O

     
    Originally Posted by phish42O View Post

    It's 50-50.

    ldo, surprised it took so many replies to get the right answer.
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