Approximate_expF_12112020, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Microsoft (R) Visual C# Compiler version 2.9.0.63208 (958f2354)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {

public static double A = 0.5843;
public static double B = 0.7892;

public static double g(double y) { return Math.Log(y);}
        
public static double f(double x) { return A*Math.Exp(-B*x); }

public static void Main(string[] args)
        {
            //Your code goes here
            Console.WriteLine("Hello, world!");
            
            // y=0.5843*e^(-0.7892*x)
            double[] Mx={-10, -9, -8, -7,-6,-5,-4,-3,-2,-1,0,1,2,3};
            double[] My={1559.5,708.5,321.9,146.2,66.4,30.2,13.7,6.2,2.8,1.3,0.6,0.3,0.1,0.1};

int N = Mx.Length;
       
for(int i=0;i<N;i++) {My[i]= f(Mx[i]);}

double Sx = 0; // сумма аргументоа
            for (int i = 0; i < N; i++) { Sx += Mx[i]; }

double Sx2 = 0; // сумма квадратов аргументов
            for (int i = 0; i < N; i++) { Sx2 += Mx[i]*Mx[i]; }

double Sgx = 0;
            for (int i = 0; i < N; i++) { Sgx += g(My[i]); }

double Sgxx = 0;
            for (int i = 0; i < N; i++) { Sgxx += g(My[i]) * Mx[i]; }

double _a = Math.Exp( (Sgxx + Sgx * Sx2 / Sx)/(Sx - N * Sx2 / Sx) );
            
            double _b = (N*Math.Log(_a) - Sgx)/(Sx);
            
            Console.WriteLine(_a);
            Console.WriteLine(_b);

}
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,25 sec, absolute running time: 0,11 sec, cpu time: 0,12 sec, average memory usage: 16 Mb, average nr of threads: 3, absolute service time: 0,39 sec