Final answer:
The probability that a randomly chosen person has varicose veins given that they drink sixty-four ounces of water per day requires additional information about the correlation between the two factors.
Step-by-step explanation:
The event in question is the probability that a randomly chosen person has varicose veins given that they drink sixty-four ounces of water per day.
This can be represented as P(V|W), where V is the event of having varicose veins and W is the event of drinking sixty-four ounces of water per day.
To find this probability, you would need additional information about the correlation between drinking water and varicose veins, such as data from a study or research.