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In queuing problems, which of the following probability distributions is typically used to describe the time to perform the service?
Xylem
Tissue in plants responsible for the transport of water and nutrients from the roots to the leaves and stems.
Cell Layer
A single or multiple layers of cells forming a barrier or a structured component in an organism.
Secondary Xylem
The part of a plant's xylem that is produced after the first growth season, providing additional support and water transport.
Sieve Tube Elements
Specialized cells in phloem of vascular plants, forming channels for transporting sugars and other nutrients.
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