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Why is the standard deviation so popular? Not because it is correct. Because that's what students are taught. It's that simple.

Little's Law's two forms can lead to two very different answers even when using the same dataset. How can one law lead to two answers?

Do you hear people throwing around words like probabilistic and deterministic forecasting, and you aren't sure exactly what they mean?

Using Little's Law requires more than plugging numbers into an equation. It takes an understanding of the underlying assumptions as well.