Root Mean Square
RMS
A kind of average sometimes used in statistics
and engineering, often abbreviated as RMS. To find the root mean
square of a set of numbers, square all the numbers in the set and
then find the arithmetic mean of the squares. Take the square
root of the result. This is the root mean square.
Formula: 
or 
Example: 
For the numbers 4 and 9,

See
also
Mean
