Final answer:
A daily inspection report is typically understood to be valid for the duration of one working day, which is usually considered to be 24 hours. The example provided suggests that the inspection report's validity aligns with a single daily cycle. For the separate example about the cleaning of rooms, the expected wait time is 8 days.
Step-by-step explanation:
The question centers around how long a daily inspection report is valid for. This report is typically used in various fields like construction, manufacturing, or transportation to ensure safety and compliance with regulations. Based on the provided hints, which suggest equivalence between operating for 12 hours and operating at half-power for 24 hours, the correct answer appears to align with a report being valid for a short, specific duration. However, without a specific context or standard regulation reference, it is difficult to determine the exact duration of validity for a daily inspection report. Normally, the term 'daily' would imply that the report is only valid for the duration of one working shift or 24 hours. Therefore, a safe assumption, in this case, would be that a daily inspection report is good for:
- a. 12 hours.
- b. 24 hours.
- c. 48 hours.
- d. 72 hours.
To address the example of waiting time for children to clean their rooms, which is uniformly distributed over a time interval from one to 15 days, the expected wait time for a parent is the average of the minimum and maximum values, hence 8 days (A).