private double ComputeEI(double bestVal, double[] forestStatistics)
{
double empMean = forestStatistics[0];
double empStdDev = forestStatistics[1];
double centered = empMean - bestVal;
double ztrans = centered / empStdDev;
return(centered * SweeperProbabilityUtils.StdNormalCdf(ztrans) + empStdDev * SweeperProbabilityUtils.StdNormalPdf(ztrans));
}