What is "X" in the following reaction? 
Definitions:
M/M/1
A basic queueing model that describes a system with a single server, exponential service times, and Poisson arrival rates.
Performance Statistics
Quantitative data and measures that are used to evaluate, analyze, and track the performance and efficiency of processes, systems, or entities.
M/M/1
A single-server queueing model in which arrivals are determined by a Poisson process and service times have an exponential distribution.
Arrival Rate
The frequency at which entities (such as customers, products, or information) arrive at a specific point or system over a given time period.
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