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.
Coefficient of variation. In the investing world, the * allows you to determine how much volatility (risk) you are assuming in comparison to the amount of return you can expect from your investment. In simple language, the lower the ratio of standard deviation to mean return, the better your risk-return tradeoff.