public Quartiles RemoveOutliers(ICollection<MyObject> objects)
{
    if (objects.Count == 0)
    {
        return new Quartiles();
    }

    // Calculate Mean value of the set.
    decimal meanValue = objects.Average(o => o.MyProperty);

    // Find the Object whose value is farthest from the Mean.
    MyObject objectFarthestFromMean = objects.OrderByDescending(o => Math.Abs(o.MyProperty - meanValue)).First();
    Quartiles quartiles = objects.Quartiles(o => o.MyProperty);

    // Remove Object if its value is more than 1.5*IQR from the Mean.
    decimal maxRange = 1.5m * quartiles.IQR;

    if (Math.Abs(objectFarthestFromMean.MyProperty - meanValue) > maxRange)
    {
        objects.Remove(objectFarthestFromMean);

        return RemoveOutliers(objects);
    }

    // No outlier found, we're finished.
    return quartiles;
}

decimal maxRange = (1.5m * quartiles.IQR);

if (Math.Abs(objectFarthestFromMean.MyProperty - meanValue) > maxRange)
{