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yashar806

Help with probability

  • one year ago
  • one year ago

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  1. yashar806
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    • one year ago
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  2. hartnn
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    sum of all probabilities must equal 1. so, add them and equate it to 1 but there are 2 values unknown.,.....

    • one year ago
  3. ParthKohli
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    The sum of all probabilities must be __

    • one year ago
  4. hartnn
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    with only one equation

    • one year ago
  5. yashar806
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    yeah, that's why I get confused

    • one year ago
  6. hartnn
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    if any one of the ??? was given, then you could have found out other ???

    • one year ago
  7. yashar806
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    answer is b , but i dont know why?

    • one year ago
  8. hartnn
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    :O

    • one year ago
  9. ParthKohli
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    Impossibru!

    • one year ago
  10. hartnn
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    i would have gone with D

    • one year ago
  11. yashar806
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    but actually answer is B

    • one year ago
  12. ParthKohli
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    The answer would be B if and only if the probability of getting A+, A, B+ and B is equal to the probability of getting C+, C, D, F. But that is not given in the question, so I'd go with Hartnn.

    • one year ago
  13. ParthKohli
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    That is, 0.5

    • one year ago
  14. hartnn
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    oh wait its possible :P

    • one year ago
  15. hartnn
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    C+ or better = 1- (C or D or E)

    • one year ago
  16. hartnn
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    P (C+ or better) = 1-P (C or D or E)) =1- (0.22+0.09+0.07)

    • one year ago
  17. yashar806
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    why we choose c ,d, e ?

    • one year ago
  18. hartnn
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    sorry, C,D,F

    • one year ago
  19. yashar806
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    yeahh, but why?

    • one year ago
  20. hartnn
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    C+ or better means A+ to C+ if we add all probabilities, we get =1 so, A+ to F = 1 (A+ to C+) + (C,D,F) =1 so, (A+to C+) = 1- (C,D,F)

    • one year ago
  21. yashar806
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    oh, I got it , thank you very much

    • one year ago
  22. hartnn
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    welcome ^_^

    • one year ago
  23. hartnn
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    ^ that.is.incorrect.

    • one year ago
  24. hartnn
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    because you don't want 5 out of 8, you need probabilities of C+ or better, which needs individual probabilities. you haven't used any of the probabilities given. also, 0.62 is different from 0.625

    • one year ago
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