Results from a marijuana drug test study showed 143 subjects with positive test results including 24 false positive results. There were 157 negative results, including 3 false negative results. What is the probability that a randomly selected subject did not use marijuana? Round to three decimal places as needed. A. 0.533 B. 0.477 C. 0.593 D. 0.523

Step 1 ：Let's denote the total number of subjects as \(total\_subjects\), the number of true negatives as \(true\_negatives\), the number of false positives as \(false\_positives\), and the number of non-users as \(non\_users\).

Step 2 ：From the problem, we know that \(total\_subjects = 143 + 157 = 300\), \(true\_negatives = 157 - 3 = 154\), and \(false\_positives = 24\).

Step 3 ：Then, we can calculate the number of non-users as \(non\_users = true\_negatives + false\_positives = 154 + 24 = 178\).

Step 4 ：Finally, we can calculate the probability that a randomly selected subject did not use marijuana as \(probability\_non\_user = \frac{non\_users}{total\_subjects} = \frac{178}{300} = 0.593\).

Step 5 ：Final Answer: \(\boxed{0.593}\)