using System;

public class Program

{

    public static void Main()

    {

        double[] dataX = Enumerable.Range(0, 5).Select(index => 

            xPoints.ToList()

                   .GetRange(xMinPoints[index], xMaxPoints[index] - xMinPoints[index] + 1)

                   .Where(j => j > 0)

                   .ToArray()

                   .Average()

        ).ToArray();

    }

}