Final answer:
PCP can be detected in urine from 1 to 8 days after use, but detection times can vary. The unrelated sample math problem calculates the expected wait time for a uniformly distributed interval from 1 to 15 days, giving an expected time of 8 days for children to clean their rooms.
Step-by-step explanation:
The question of how long after taking PCP (phencyclidine) it can still be found in urine is a health-related question, specifically dealing with pharmacokinetics, which is the study of how drugs are metabolized and excreted from the body. The detection time for PCP in the urine can vary based on several factors, such as the amount used, the frequency of use, individual metabolism, and the sensitivity of the drug test. However, on average, PCP can typically be detected in urine for 1 to 8 days after use for occasional users, and possibly longer for chronic users.
For the unrelated sample question provided regarding the expectation time for children to clean their rooms, which appears to be a probability or statistics problem often found in mathematics, the expected wait time can be calculated as the average in a uniformly distributed interval. In this case, the time between 1 and 15 days is given, so the expected wait time would be the average of the start and end points, which is (1+15)/2, yielding 8 days as the answer.