On discovering that her family had a 70% risk of heart attack, Erin took a treadmill test to check her own potential of having a
heart attack. The doctors told her that the reliability of the stress test is 67%. The test predicted that Erin will not have a heart attack. What is the probability after the test was taken that she will not have a heart attack?
Erin took two test. First test saying that she has 70% risk of heart attack(which means 30% chance of not have). The second test saying she has 67% chance of not have a heart attack.
Then, the probability of Erin will not have attack would be: 30%*67%= 20.1% = 0.201
