Posted by **Johnson** on Saturday, February 4, 2012 at 4:50am.

Two group of male students cost their past on a particular proposal.the result are as follows: Group infavour against A 128 32 B 96 48 <a> if a student in favour of proposal is selected for a post. What is the probability that he is from group A ?

** if a student is chosen at random, what is the probability that he is against proposal.**
- Probability -
**bobpursley**, Saturday, February 4, 2012 at 5:49am
Nuts to this, it makes no sense.

What does "cost their past" mean?

If you mean

group A in favor: 128

group A opposed: 32

group B in favor: 96

group B opposed: 48

Now if all those infavor (128+96), if one is selected, Pr(A)=128/(128+96)

If a student is chosen at random,

Pr(against)=totalagainst/total students

= (32+48)/(128+32+96+48)

- Probability -
**drwls**, Saturday, February 4, 2012 at 6:17am
I am also confused by what "in favour against" means.

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