A LARGE part of statistical theory is based on the assumption that measurements are distributed in normal probability curves and that the variance is constant. The normal curve was discovered by de ...

Over the last few decades, Lean Six Sigma has become an integral part of the world of business. It is one of the most ...

De Moivre's original derivation of the normal curve in a 7 page Note in Latin and its English translations in the 1738 and 1756 editions of his The Doctrine of Chances are described. Karl Pearson's ...