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Pulsified333

  • one year ago

Two fair die are rolled. What is the probability of one of the dice showing 5 or the sum being at least 8?

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  1. Pulsified333
    • one year ago
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    well I know the sum of 8's probability is 5/36

  2. Pulsified333
    • one year ago
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    right so wouldn't it be 1/6?

  3. anonymous
    • one year ago
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    + the probability of at least 8

  4. Pulsified333
    • one year ago
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    so would it be 6/36?

  5. Pulsified333
    • one year ago
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    you mean 2/36?

  6. Pulsified333
    • one year ago
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    so the answer would be 7/36?

  7. anonymous
    • one year ago
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    sorry can you forget about what I just said?

  8. Pulsified333
    • one year ago
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    yeah

  9. Pulsified333
    • one year ago
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    why?

  10. anonymous
    • one year ago
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    for at least one to be a 5 would be 11/36

  11. anonymous
    • one year ago
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    (for each dice)( 1/6 + 1/6) - 1/36 (because there's a double) = 11/36

  12. Pulsified333
    • one year ago
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    so the answer is 11/36?

  13. anonymous
    • one year ago
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    + at least 8

  14. Pulsified333
    • one year ago
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    so 11/36+16/36

  15. anonymous
    • one year ago
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    - the mutual part

  16. Pulsified333
    • one year ago
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    -1?

  17. Pulsified333
    • one year ago
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    13/18?

  18. anonymous
    • one year ago
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    -6/36

  19. anonymous
    • one year ago
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    21/36

  20. Pulsified333
    • one year ago
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    why -6/36

  21. anonymous
    • one year ago
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    because (5,1)(5,2)(5,3)(3,5)(2,5)(1,5) are included in both probabilities.

  22. Pulsified333
    • one year ago
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    oh let me check

  23. anonymous
    • one year ago
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    I hope that's right.

  24. Pulsified333
    • one year ago
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    would it be 7/12? simplified

  25. anonymous
    • one year ago
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    yes

  26. Pulsified333
    • one year ago
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    I did it backwards the sum of being at least 8 would be 17/36

  27. Pulsified333
    • one year ago
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    my bad i didn't see the at least 8

  28. anonymous
    • one year ago
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    ooh so otherwise would it be right?

  29. Pulsified333
    • one year ago
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    I think but it would be 22/36= 11/18

  30. anonymous
    • one year ago
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    ok ok :)

  31. Pulsified333
    • one year ago
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    it says not correct

  32. anonymous
    • one year ago
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    :(

  33. anonymous
    • one year ago
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    isn't at least 8 = 15/36?

  34. Pulsified333
    • one year ago
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    how?

  35. Pulsified333
    • one year ago
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    8=5/36, 9=6/36, 10= 3/36, 11=2/36, 12=1/36

  36. anonymous
    • one year ago
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    9 has 4 combinations

  37. Pulsified333
    • one year ago
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    your right

  38. Pulsified333
    • one year ago
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    26/36

  39. anonymous
    • one year ago
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    15/36 + 11/36 - 6/36 = 20/36

  40. Pulsified333
    • one year ago
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    5/9?

  41. anonymous
    • one year ago
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    wait wait...

  42. Pulsified333
    • one year ago
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    ok

  43. anonymous
    • one year ago
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    yes I think 5/9.

  44. Pulsified333
    • one year ago
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    I don't get this it says its wrong

  45. anonymous
    • one year ago
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    :o is this an online thing?

  46. Pulsified333
    • one year ago
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    yeah

  47. anonymous
    • one year ago
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    ok try 26/36 then

  48. Pulsified333
    • one year ago
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    i only have 2 more attempts

  49. anonymous
    • one year ago
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    :( I don't get it the events are not mutually excessive so it should be 20/36 but if the test writer is dumb it might be 26/36...

  50. anonymous
    • one year ago
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    I'm sorry I'm dumb too probably.

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