using System;
using System.Linq;

public class Test
{
	public static void Main()
	{
		Func<double[],double>[] array = new Func<double[],double>[] {MeanAbsoluteValue.Calculate};
        double[] args = new[] {1.2, -3.4, 5.6};
        double res = array[0](args);
        Console.WriteLine(res);
	}
}

public static class MeanAbsoluteValue{
    public static double Calculate(double[] data){
        return data.Sum(s => Math.Abs(s)) / data.Length;
    }
}