Around

Around[x, δ] represents an approximate number or quantity with a value around x and an uncertainty δ.

Around[x, {δ-, δ+}] represents a number or quantity with a value around x and asymmetric uncertainties δ-, δ+.

Around[list] gives an approximate object around the mean of the elements of list with an uncertainty corresponding to their standard deviation.

Examples

Create a number with uncertainty:

Around[10, 2]
(* 10 ± 2 *)

Arithmetic with uncertainties:

Around[10, 1] + Around[5, 0.5]
(* Around[15, 1.12] *)

Please visit the official Wolfram Language Reference for more details.