In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Beau Schwabe wrote:

This method creates a "Window" of averaged numbers where each new number is capable of affecting the instantaneous outcome by...  100% / #Samples ... i.e. if you set your samples to 20, then every New data value can affect the output average by 5% instantly, where as if you add 20 values and then divide by 20, not only is your data throughput cut by a factor of 20, but the result isn't instantaneous.

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