shithub: sm2

ref: 64a7dd4b6d12588c5f9dbdd858693abcb9f63966
dir: /stt/arithmeticmean.t/

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The arithmetic mean of a variable X is ...
.Bp
The arithmetic mean of a variable X is:

.EQ
X highbar = {sum from 0 to N {X sub i}} over N
.EN