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%. What is the probability that Erin will not have a heart attack and the test predicts that she will?
A.
0.099

B.
0.201

C.
0.231

D.
0.469

Answer 1

Thank you for asking this question. Here is your answer:

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

If there is any confusion please leave a comment below.

Answer 2

Answer:

answer is D, 0.469

Step-by-step explanation:

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