If the mean and coefficient of variation are `10 and 5` respectively, then the standard deviation is ​

Two teams "A" and "B" have the same mean and their coefficients of variation are 4,2 respectively.If sigma_(A),sigma_(B) are the standard deviations of teams A,B respectively then the relation between them is

If the coefficient of variation of a distribution is 45% and the mean is 12, then its standard deviation is

If the coefficient of variation and standard deviation are 60 and 18 respectively, the arithmetic mean of distribution Is :