Question

How to calculate error estimate in given data table?

Answer 1

If we have n values of $x_i$ in the table, the mean $<x>=(Σ_{i=1}^nx_i)/n.$

The error of $<x>$ is $S_x=\sqrt{Σ_{i=1}^n(x_i-<x>)^2/(n-1)}$