Ex, C# - rextester

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

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            Random rn = new Random();
            List<int> values = new List<int>();
            
            for (int i = 0; i < 1000; ++i)
            {
                double percentage = rn.NextDouble();
                if (percentage >= 0.3)
                {
                    values.Add(rn.Next(20, 70));
                }
                else if (percentage >= 0.1)
                {
                    values.Add(rn.Next(0, 20));
                }
                else
                {
                    values.Add(rn.Next(70, 100));
                }
            }
                               
            foreach (var val in values.GroupBy(v => v  / 5).OrderByDescending(g => g.Count()))
            {
                Console.WriteLine("{0} , {1}", val.Key * 5, val.Count());
            }
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 1.44 sec, absolute running time: 0.38 sec, cpu time: 0.24 sec, memory peak: 39 Mb, absolute service time: 1,89 sec