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The population of registered voters contains 45% republicans and 55% democrats. If 25% of republicans and 75% of democrats favor an issue, and a person who is chosen at random favors the issue, what is the probability that she
was a democrat?
 one year ago
 one year ago
The population of registered voters contains 45% republicans and 55% democrats. If 25% of republicans and 75% of democrats favor an issue, and a person who is chosen at random favors the issue, what is the probability that she was a democrat?
 one year ago
 one year ago

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tomoBest ResponseYou've already chosen the best response.0
This is what i have come up with so far. P(republican) = .45 P(democrat) = .55 P(republican and favors) = .25*.45 P(democrat and favors) = .75 *.55 P(favor) = P(republican AND favors) + P (democrat AND favors) therefore P(democrat given that favors) = P(democrat and favors)/ (Pfavors)
 one year ago

blurbendyBest ResponseYou've already chosen the best response.1
Hm, well this is what I came up with. Still thinking about it. 45*4 republicans and 55*4 democrats, let If 25% of republicans favor an issue means=45 and 75% of democrats favor an issue means = 165 total who favours = 210 P of her to be democrat= 165/210 .785
 one year ago

tomoBest ResponseYou've already chosen the best response.0
yeah, I got .786 too. I was confused if the question was asking about P(democrat given that she favors the bill) or something like P(democrat and favors), but we are given that in the problem statement.
 one year ago

blurbendyBest ResponseYou've already chosen the best response.1
I'm pretty sure it's ~.785
 one year ago

blurbendyBest ResponseYou've already chosen the best response.1
Would be nice to get a second opinion though
 one year ago

kropot72Best ResponseYou've already chosen the best response.0
I get P(democrat) = 0.7857
 one year ago

tomoBest ResponseYou've already chosen the best response.0
same here. i just rounded up
 one year ago
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