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- anonymous

Help with probability

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- anonymous

Help with probability

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- anonymous

- hartnn

sum of all probabilities must equal 1.
so, add them and equate it to 1
but there are 2 values unknown.,.....

- ParthKohli

The sum of all probabilities must be __

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- hartnn

with only one equation

- anonymous

yeah, that's why I get confused

- hartnn

if any one of the ??? was given, then you could have found out other ???

- anonymous

answer is b , but i dont know why?

- hartnn

:O

- ParthKohli

Impossibru!

- hartnn

i would have gone with D

- anonymous

but actually answer is B

- ParthKohli

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

That is, 0.5

- hartnn

oh wait its possible :P

- hartnn

C+ or better = 1- (C or D or E)

- hartnn

P (C+ or better) = 1-P (C or D or E))
=1- (0.22+0.09+0.07)

- anonymous

why we choose c ,d, e ?

- hartnn

sorry, C,D,F

- anonymous

yeahh, but why?

- hartnn

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)

- anonymous

oh, I got it , thank you very much

- hartnn

welcome ^_^

- hartnn

^ that.is.incorrect.

- hartnn

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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