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a$)$ What is the bullwhip measure for the retailer?

The bullwhip measure for the retailer is $61\mathrm{.}82.($Enter your response rounded to two decimal places.$)$

More Info

$\backslash$table$[[$Week$,$Retailer,Manufacturer,Supplier$],[1,90,180,600],[2,90,,],[3,210,420,],[4,210,,1,460],[5,310,620,],[6,310,,],[7,420,840,],[8,420,,]]$