using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace NSAnalysis
{
    public static class EnumerableExtensions
    {
        public static double StandardDeviation(this IEnumerable<double> values)
        {
            double avg = values.Average();
            double sum = values.Sum(d => Math.Pow(d - avg, 2));
            return Math.Sqrt((sum) / (values.Count() - 1));
        }
    }
}