Attractive nuisances can create liability risks. Learn what a home attractive nuisance is and see the most common attractive nuisance examples.
In mathematics, the harmonic mean (sometimes called the subcontrary mean) is one of several kinds of average, and in particular one of the Pythagorean means. Typically, it is appropriate for situations when the average of rates is desired. The harmonic mean can be expressed as the reciprocal of the arithmetic mean of the reciprocals. As a simple example, the harmonic mean of 1, 2, and 4 is 3 1 1 + 1 2 + 1 4 = 1 1 3 ( 1 1 + 1 2 + 1 4 ) = 12 7 .
Watch the teams compete. For the given two quantities, 20 and 30, the number (20 + 30)/2 is known as their arithmetic mean while 2/(1/20 + 1/30) is the harmonic mean of the two numbers. We just observed that the arithmetic mean (the average) of two numbers 20 and 30 is not less than their harmonic mean.