The provided question involves different topics relating to probability, time intervals, and philosophical thoughts on certainty, which require additional context and are not directly related. Without specific information regarding the flights and delivery schedules, exact probabilities cannot be computed, and the philosophical component is outside the scope of a mathematical answer.
The question appears to be about the probability of certain events occurring relative to time intervals specific to everyday understanding, such as the duration of a plane flight or the timing of a clock's indication. The question also touches on philosophical considerations about certainty and probability. Unfortunately, the question contains multiple parts that are not fully connected, making it difficult to provide a single, unified answer. Furthermore, some elements of the question prompt, such as the plane leaving at a specific time in the future, do not have a clear connection to typical mathematical probability problems.
To address the questions related to probability and time:
- For the question about the duration of a plane's flight, the probability cannot be assessed without additional contextual information about the flight itself.
- The probability of an event happening within a particular time frame, from 4 to 7 p.m., can be calculated if we're discussing how much time is left in the day or within a certain window.
- For the probability of waiting at least one and a half more hours past noon on a delivery day, additional information would be needed about the delivery times distribution to provide an answer.
The philosophical aspect of the question concerns the nature of certainty and belief, invoking the thoughts of David Hume and the hypothetical situation proposed by Bertrand Russell. However, it strays from the primary focus on probability as it pertains to mathematics.
Complete Question:
our palne leaves half past seven tomorrow morning.(a) true in present,(b)happens regularly,(c)fixed in future(d)always true .which option is correct.