That is to say, if X is a random variable and c is a constant:RMD(X + c) = RMD(X) ???? mean(X)/(mean(X) + c) = RMD(X) / (1+c / mean(X)) for c????? -mean(X),RMD(-X) = ???????RMD(X), andRMD(cX) = RMD(X) for c> 0.If a random variable has a positive mean, then its relative mean difference will always be greater than or equal to zero.