"Little's law" meaning in English

{
  "etymology_text": "The theorem was proposed by John Little.",
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  "lang_code": "en",
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      "glosses": [
        "A theorem which states that the long-term average number L of customers in a stationary system is equal to the long-term average effective arrival rate λ multiplied by the average time W that a customer spends in the system."
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          "stationary",
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      "raw_glosses": [
        "(probability theory) A theorem which states that the long-term average number L of customers in a stationary system is equal to the long-term average effective arrival rate λ multiplied by the average time W that a customer spends in the system."
      ],
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        "mathematics",
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  "etymology_text": "The theorem was proposed by John Little.",
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        "A theorem which states that the long-term average number L of customers in a stationary system is equal to the long-term average effective arrival rate λ multiplied by the average time W that a customer spends in the system."
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        "(probability theory) A theorem which states that the long-term average number L of customers in a stationary system is equal to the long-term average effective arrival rate λ multiplied by the average time W that a customer spends in the system."
      ],
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        "mathematics",
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