MeanAround

MeanAround[{x1,x2,x3,…}] gives an Around object describing the mean of the xi and its uncertainty.

MeanAround[{{x11,x12,…},{x21,…},…}] gives a VectorAround object describing the means of the vectors xi and their covariance.

Examples

Compute mean with uncertainty:

MeanAround[{1.2, 1.5, 1.3, 1.4}]
(* Around[1.35, 0.065] *)

Please visit the official Wolfram Language Reference for more details.