Dictionary

standard deviation

standard deviation

noun

Definition of STANDARD DEVIATION

1
:  a measure of the dispersion of a frequency distribution that is the square root of the arithmetic mean of the squares of the deviation of each of the class frequencies from the arithmetic mean of the frequency distribution; also :  a similar quantity found by dividing by one less than the number of squares in the sum of squares instead of taking the arithmetic mean
2
:  a parameter that indicates the way in which a probability function or a probability density function is centered around its mean and that is equal to the square root of the moment in which the deviation from the mean is squared

First Known Use of STANDARD DEVIATION

1894

Browse

Next Word in the Dictionary: standard distancePrevious Word in the Dictionary: standard dealAll Words Near: standard deviation
March 01, 2015
macaroni Hear it
Tube-shaped pasta or a fop or dandy
Take a 3-minute break and test your skills!
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears