To be certified as a PADI Open Water Diver, you need to be at least 10 years old*, fit for diving, and able to swim. To be able to participate in the PADI eLearning Open Water online program, you simply need to be at least 10 years old.*In some regions the minimum age is higher.illions of people have started diving as certified PADI Open Water Divers. Learning to scuba dive requires both knowledge development (facts, principles, concepts) and dive skills (techniques, methods).
Coefficient of Variation. In statistics, the ratio of the standard deviation of a series of data points to the expected return. In investing, the coefficient of variation is used to measure the volatility (represented by the standard deviation) to the expected return on an investment.A lower coefficient of variation indicates a higher expected return with less risk.n investing, the coefficient of variation is used to measure the volatility (represented by the standard deviation) to the expected return on an investment.
(Redirected from Standard deviation/mean). Not to be confused with Coefficient of determination. In probability theory and statistics, the coefficient of variation (CV), also known as relative standard deviation (RSD), is a standardized measure of dispersion of a probability distribution or frequency distribution.t is often expressed as a percentage, and is defined as the ratio of the standard deviation to the mean (or its absolute value,). The CV or RSD is widely used in analytical chemistry to express the precision and repeatability of an assay.