Final answer:
The estimated percentage of idle time cannot be determined without specific data. To calculate the percentage of idle time, the actual idle time and the total time of operation are needed. Mathematical formulas and probabilities mentioned are not related to idle time estimation.
Step-by-step explanation:
The estimated percentage of idle time cannot be directly calculated from any of the provided information. To estimate the percentage of idle time, we would need specific data that tells us the total time a system or process is operational and the portion of that time it remains idle. In a mathematical context, if idle time is given, its percentage can be calculated by using the formula Idle Time Percentage = (Idle Time / Total Time) × 100%. This formula can be applied to different scenarios, such as production processes, computer usage, or waiting times in a service scenario.
Based on the statement regarding statistics students, we learned about confidence intervals for proportions but this doesn't provide information on idle time. Similarly, the probability calculations for household personal computer usage for entertainment or the mean time frame.