Question: A psychologist believes one in every four people has a disorder he calls ZYX syndrome. The clinic where he works has recently doubled its previous number of 26 patients. How many patients is the psychologist likely to diagnose with ZYX syndrome?
Solution:
The clinic has 26 * 2 = 52 patients.
The psychologist believes 1/4 of people have the disorder, so he is likely to diagnose 52 / 4 = 13 patients with ZYX syndrome.
Answer: 13