find the variance of all keys in a map in csharp

To find the variance of all keys in a map in C#, you can use LINQ to calculate the variance of the map's keys.

Here is some code that demonstrates how to calculate the variance of a dictionary's keys in C#:


main.cs
using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        Dictionary<int, string> dict = new Dictionary<int, string>()
        {
            { 1, "one" },
            { 2, "two" },
            { 3, "three" },
            { 4, "four" },
            { 5, "five" }
        };

        double mean = dict.Keys.Average();
        double variance = dict.Keys.Select(x => (x - mean) * (x - mean)).Average();

        Console.WriteLine($"Mean: {mean}");
        Console.WriteLine($"Variance: {variance}");
    }
}
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In this example, we create a dictionary dict with some keys and values. Then, we calculate the mean of the keys using Average() method, and the variance of the keys using Select() method in combination with some arithmetic operations and Average() method. Finally, we print the mean and variance to the console.

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