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okay let me see

lets say 10,000 people have the transplant
how many try to reject the kidney?

3200

and how many don't ?

6800

20% of negative tests prove to be incorrect.
how many is that?

of 10000?

no

oh

so thats not the answer?

what is 20% of 3200?

640

3200-640= 2560?

those are the people who have a negative nest that is right

now for the next part

so is what I did wrong?

6800 do not reject
3200 do reject

out of the the 3200 who do reject, 640 get the wrong answer (negative) and 2560 get the right answer

so I have the answer in the work I did earlier

no not yet, and i still got myself confused, damn
we need to work the the 6% now

now we can finish (thank god)

the number that test positive (if i did it correctly) is 2560+408

3608

and the number of people who test positive and have it is 2560

okay

Pr(A|B) = (Pr(B|A)Pr(A))/Pr(B)

we need the percent of people that you test positive and have it, which is \[.32\times .80\]

that is your numerator

and you need percent who test positive \[.32\times .80+.68\times .06\]

should be the same answer

as?

http://www.wolframalpha.com/input/?i=2560%2F%282560%2B408%29

Which one?

they are the same

I see

:D it worked thanks.

I have to finish as fast as I can so that I can study for my midterm tomorrow