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Can someone help me with this probability question?
The chart reads:
Positive test result(pregnancy is indicated)
-subject is pregnant; 80
-subject is not pregnant; 3
Negative test result(pregnancy is not indicated)
-subject is pregnant; 5
-subject is not pregnant; 11
The questions says: if 2 different subjects are randomly selected, find the probability that they both test positive for pregnancy
I know the answer which is .702 but I don't know how to get that answer. So can some one help me work through it
1 Answer
- M3Lv 77 years agoFavorite Answer
although i have got the answer you seek, this is a poorly worded question without comprehensive data
there are a total of 99 women of whom 83 test +ve
if you choose 2 randomly,
P(both +ve) = 83/99 *82/88 = .702