Consider the supply chain illustrated below: Last year the retailer's weekly variance of demand was $210$ units. The variance of orders was $\backslash (510,600,730\backslash ),$ and $1,380$ units, for the retailer, wholesaler, distributor, and manufacturer, respectively. $($Note that the variance of orders equals the variance of demand for that firm's supplier.$)$ a$)$ The bullwhip measure for the retailer is $($ter your response rounded to two decimal places.$)$