using System;
using System.Collections.Generic;
using System.Linq;
public class Test
{
public static void Main()
{
var list=new List<double>(){39,49,29,32,449,299,229,492,392,493};
var ave=list.Average();
var disp=list.Average(data=>Math.Pow(data-ave,2));
Console.WriteLine(disp);
}
}
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