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.
At the other hand, the red-cell distribution width coefficient of variation is expressed as a percentage and is calculated from the standard deviation and the mean corpuscular volume. In other words, the RDW (CV) is dependent upon the size of the red blood cells. Normal values lies between 11.6 â 14.6%.t the other hand, the red-cell distribution width coefficient of variation is expressed as a percentage and is calculated from the standard deviation and the mean corpuscular volume. In other words, the RDW (CV) is dependent upon the size of the red blood cells. Normal values lies between 11.6 â 14.6%.