5 Three out of every 1,000 low-risk 50-year-old males have colon cancer. If a man has colon cancer, a test for hidden blood in the stool will indicate hidden blood half the time. If he does not have colon cancer, a test for hidden blood in the stool will indicate hidden blood 3% of the time.

If the hidden-blood test turns out positive for a low-risk 50-

year-old male, what is the chance that he has colon cancer?