combined standard uncertaintystandard uncertainty of the result of a measurement when that result is obtained from the values of a number of other quantities, equal to the positive square root of a sum of terms, the terms being the variances or covariances of these other quantities weighted according to how the measurement result varies with changes in these quantities. JCGM 100:2008 2.3.4.
MEAN
2.2
standard uncertaintyuncertainty of the result of a measurement expressed as a standard deviation. JCGM 100:2008 2.3.1 using arithmetic mean or average the observations. JCGM 100:2008 4.2