Find Average from datatable column using LINQ and Compute Method

--Using LINQ

var v = (from o in dt.Rows.Cast()
select o.Field("Grand Total")).Average();

--Using Datatable Compute Method

Object objAvg;
objAvg = dt.Compute("Avg([Grand Total])", "[Grand Total] > 0");

--Find Standard Deviation using Datatable Compute method

Object objStDev;
objStDev = dt.Compute("StDev([Grand Total])", "[Grand Total] > 0");