find the standard deviation of all values in a map in csharp

To find the standard deviation of all values in a map in C#, you can use the following code:

main.cs
using System;
using System.Linq;

Dictionary<string, double> data = new Dictionary<string, double>()
{
    { "A", 10.0 },
    { "B", 20.0 },
    { "C", 30.0 },
    { "D", 40.0 }
};

double average = data.Values.Average();
double sumOfSquares = 0.0;

foreach (double value in data.Values)
{
    sumOfSquares += Math.Pow((value - average), 2);
}

double standardDeviation = Math.Sqrt(sumOfSquares / data.Values.Count);

Console.WriteLine("The standard deviation of the data is: " + standardDeviation);
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In this code, we first create a dictionary named data, which contains our sample data. We then calculate the average of all the values in the dictionary using Average() method. We then iterate over all the values and calculate the sum of squares of difference between each value and the average. Finally, we calculate the standard deviation using the formula sqrt(sum of squares / number of values). We use Math.Sqrt() method to calculate the square root of the sum of squares divided by the number of values.