using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var scores = new[] { 87, 56, 33, 20, 11, -10, -50 };

​

​

        // divide each number by 100 before summing.

        double sum = scores.Sum(i => i/100d);

        Console.WriteLine(sum);

    }

}