anonymous
  • anonymous
Help with probability
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
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hartnn
  • hartnn
sum of all probabilities must equal 1. so, add them and equate it to 1 but there are 2 values unknown.,.....
ParthKohli
  • ParthKohli
The sum of all probabilities must be __

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More answers

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