Given the following information,what is the variance of the returns on this stock? 
Definitions:
Safety Inventories
Additional quantities of stock kept on hand to prevent out-of-stock situations due to uncertainties in supply or demand.
Annual Holding Cost
The total expenses associated with storing unsold goods or materials for one year, including warehousing, depreciation, insurance, and opportunity costs.
UPS
United Parcel Service, a global package delivery and supply chain management company known for its shipping, freight, and logistics services.
FedEx
An international courier company from America, celebrated for its expedited shipping service and for introducing a tracking system that allows for live updates of a parcel's location.
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