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Arithmetical Mean
Arithmetical Mean, or Average, of two or more numbers, the n-th part of their sum, where n is the number taken. Thus the A.M. of three numbers is one-third their sum.
Arithmetical Mean, or Average, of two or more numbers, the n-th part of their sum, where n is the number taken. Thus the A.M. of three numbers is one-third their sum.