C# standard deviation

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C#

Visual-Studio

calculus

, +

Guys. Im a c# noob but I really need a professional's help. I am using visual studio 2005 for a project so I dont have math.linq I need to calculate the standard deviation of a generic list of objects. The list contains just a list of float numbers, nothing too complicated. However I have never done this before so i need someone to show me that has calculated standard deviation of a generic list before. Here is my code that I tried to start on:

//this is my list of objects inside. The valve data just contains a bunch of floats.
public class ValveDataResults
{
    private List<valvedata> m_ValveResults;

    public void AddValveData(ValveData valve)
    {
        m_ValveResults.Add(valve);
    }
    
    //this is the function where the standard deviation needs to be calculated:
    public float LatchTimeStdev()
    {
        //below this is a working example of how to get an average or mean
        //of same list and same "LatchTime" that needs to be calculated here as well. 
    }

    //function to calculate average of latch time, can be copied for above st dev.
    public float LatchTimeMean()
    {
        float returnValue = 0;
        foreach (ValveData value in m_ValveResults)
        {
            returnValue += value.LatchTime; 
        }
        returnValue = (returnValue / m_ValveResults.Count) * 0.02f;
        return returnValue;
    }</valvedata>

the "Latch Time" is a float object of the "ValveData" object which is inserted into the m_ValveResults list.

thats it. any help would much be appreciated. Thanks

[Modified: if you add <pre lang="cs"> before the code and </pre> after the code, it will format it for you!]