void mdian1(double x[], int n, double& xmed)
{
	int n2;
    sort(n, x);
    n2 = n / 2;
    if (2 * n2 == n)
	{
        xmed = 0.5 * (x[n2] + x[n2 + 1]);
	}
    else
	{
        xmed = x[n2 + 1];
    }
}