The earliest mathematical analysis of the theory of probability dates back to the eighteenth century. Abraham DeMoivre, a French mathematician, discovered that a mathematical relationship explains the probabilities associated with various games of chance. He developed the equation and the graphic pattern that describe it. It has been found to describe the fluctuations of chance error of observation and measurement. Some understanding of the theory of probability and the nature of the curve of normal distribution is necessary for comprehension of many important statistical concepts, particularly in the area of standard scores, the theory of sampling and inferential statistics. The law of probability and the normal curve ...

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