Definition: The median is the value separating the higher half of a data sample, a population, or a probability distribution, from the lower half. In simple terms, it may be thought of as the "middle" value of a data set. For example, in the data set {1, 3, 3, 6, 7, 8, 9}, the median is 6, the fourth number in the sample. The median is a commonly used measure of the properties of a data set in statistics and probability theory.

Examples:

1.) If there is an odd number of numbers, the middle one is picked. For example, consider the set of numbers:

1, 3, 3, 6, 7, 8, 9This set contains seven numbers. The median is the fourth of them, which is 6.

2.) In the data set:

1, 2, 3, 4, 5, 6, 8, 9The median is the mean of the middle two numbers: this is (4 + 5) ÷ 2, which is 4.5.

- Median on Wikipedia

So - Here's some code to do it :)

class Program { static void Main(string[] args) { List<double> exampleOne = new List<double> { 1, 3, 3, 6, 7, 8, 9 }; List<double> exampleTwo = new List<double> { 1, 2, 3, 4, 5, 6, 8, 9 }; List<double> exampleThree = new List<double> { 0, 1, 2, 4, 6, 5, 3 }; double medianOne = exampleOne.Median(); double medianTwo = exampleTwo.Median(); double medianThree = exampleThree.Median(); Console.WriteLine(medianOne); // 6 Console.WriteLine(medianTwo); // 4.5 Console.WriteLine(medianThree); // 3 Console.ReadLine(); } } public static class ListExtensions { public static double Median(this List<double> inputList) { double[] xs = inputList.ToArray(); Array.Sort(xs); return xs[xs.Length / 2]; } }