yashar806
Help with probability
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yashar806
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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.,.....
ParthKohli
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The sum of all probabilities must be __
hartnn
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with only one equation
yashar806
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yeah, that's why I get confused
hartnn
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if any one of the ??? was given, then you could have found out other ???
yashar806
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answer is b , but i dont know why?
hartnn
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:O
ParthKohli
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Impossibru!
hartnn
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i would have gone with D
yashar806
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but actually answer is B
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.
ParthKohli
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That is, 0.5
hartnn
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oh wait its possible :P
hartnn
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C+ or better = 1- (C or D or E)
hartnn
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P (C+ or better) = 1-P (C or D or E))
=1- (0.22+0.09+0.07)
yashar806
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why we choose c ,d, e ?
hartnn
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sorry, C,D,F
yashar806
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yeahh, but why?
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)
yashar806
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oh, I got it , thank you very much
hartnn
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welcome ^_^
hartnn
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^ that.is.incorrect.
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