Answer: Coefficient of variation
Step-by-step explanation:
The coefficient of variation is the term which is generally used in the probability theory and also in the statistics.
This is basically used for measure the total dispersion of the frequency distribution in the probability concept.
The coefficient of variation is also called as the relative standard deviation and it is generally use to express in the form of percentage. It is basically providing the risk measure o the expected return and it also shows risk as per unit return.
Therefore, Coefficient of variation is the correct answer.