Overall, the mean household income in the United States, according to the US Census Bureau 2014 Annual Social and Economic Supplement, was $72,641, or $20,702 (39.86%) higher than the median household income ($51,939).ne key measure is the real median level, meaning half of households have income above that level and half below, adjusted for inflation. According to the Federal Reserve, this measure was $51,939 in 2013, below the 1999 peak of around $57,000.
DEFINITION of 'Geometric Mean'. The average of a set of products, the calculation of which is commonly used to determine the performance results of an investment or portfolio. Technically defined as the 'n'th root product of 'n' numbers, the formula for calculating geometric mean is most easily written as:
Geometric Meaning of the Geometric Mean. The geometric mean of two positive numbers a and b is the (positive) number g whose square equals the product ab : g Â² = ab. While it is possible to (at least partially) adapt the definition to handle negative numbers, I do not believe this is ever done.he length of the common tangent of two circles of diameters a and b that are tangent externally is the geometric mean of the diameters: The geometric mean appeared as a tangent to a circle in John Wallis' very first geometric interpretation of complex numbers: