Assertion: variable's variance | /r/HasProperty | the sum of the variances
Facets:
Source sentences:
text: This similarly follows from the fact that the variance of a sum of independent random variables is the sum of the variances.
text: One reason for the use of the variance in preference to other measures of dispersion is that the variance of the sum (or the difference) of uncorrelated random variables is the sum of their variances: