Final answer:
The '45 minutes for holding' is likely an average hold time or a particular percentile from a dataset, but additional context is needed to determine its exact source. The 90th percentile data suggests that in another context, holding times are much shorter, with 90 percent of values at or below 13.5 minutes.
Step-by-step explanation:
The question regarding the '45 minutes for holding' and its origin seems to be about average waiting times and how these averages are calculated. Based on the information provided, we could interpret that the 45-minute figure might be an average holding time derived from a certain dataset or a standard used in a specific industry or context. It is not exactly clear from the context given, but if we take the '90th percentile' data into account, we can understand that in a different measurement, 90 percent of waiting times are at most 13.5 minutes.
In this context, the '90th percentile' is a statistical measure indicating that 90 percent of the observed values fall below the 13.5 minutes mark. This can help us infer that the 45-minute period could be an average or another percentile that has not been explicitly mentioned. In statistics, different percentiles are often used to understand the distribution of data, with the median (50th percentile) being a common measure for the 'middle' of a dataset.
Therefore, to determine where the '45 minutes for holding' comes from, one would need more information about the specific context or dataset from which this average or percentile was derived.