
204 Quality management for organizations using Lean Six Sigma techniques
• Property of Poisson distribution
• The number of occurrences in one interval is independent of the number of
occurrences in any other disjoint interval. This property is called memoryless
property of Poisson distribution.
12.4.3 Normal distribution
De Moivre developed the fundamental mathematical equation of normal curve in 1733.
Carl Friedrich Gauss (1777–1855) individually developed the normal distribution based
on the errors in repeated measurements on the same quantity. This normal distribution
is a bell-shaped distribution used extensively in quality control and ...