[Solved] Consider a single-line, single-server waiting line system. Suppose that customers arrive according to a Poisson distribution at an average rate of 50 per hour, and the average (exponentially distributed) service time is 45 seconds per customer. What is the probability that 4 customers are in the system? Seven Components: Typically refers to the essential elements or parts that make up a whole; context needed for a specific definition. Visible Fibers: Fibrous materials or threads that can be seen with the naked eye, often referring to those found in textiles, paper, or other composite materials. Invisible Fibers: Microscopic or very fine fibers that are not visible to the naked eye, which can be natural or synthetic and have various applications, including in textiles and forensic science. Black (UV) Light: Ultraviolet light that is not visible to the human eye but can cause fluorescent materials to glow, often used for amusement or inspection.