Question

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?

0.4051



0.5010



0.4653



0.6632

Answer 1

The probability that she will not have a heart attack is 0.4653

Explanation:

So, option C. 0.4653 is correct for plato

Answer 2

100% - 70% = 30% = 0.30
100% - 67% = 33% = 0.33

67% = 0.67
70% = 0.70


(0.3*0.67) / (0.3*0.67 + 0.7*0.33) =

0.201 / (0.201 + 0.231)=

0.201 / 0.432 = 0.4653