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 have a heart attack and the test predicts it?
A. 0.099



B. 0.201



C. 0.231



D. 0.469

Thanks to anyone helping.

Answer 1

The answer is .469  its just simply both percentages as percents multiplied together so .7*.67= .469

Answer 2

The answer is 0.469,
You just multiply the percentages. But before you do, make them a simple number. (not percentage).
0.7 × 0.67 = 0.469.