shithub: sm2

ref: 9257482d28dbf820a598cfd3bc7f6f3a3e63b95a
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