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Help with probability

Mathematics
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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.,.....
The sum of all probabilities must be __

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Other answers:

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

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