Given the following data,compute the mean squared deviation (error). 
Definitions:
Actual Cost
The true total amount spent on a project or acquisition, including all relevant expenses and fees.
Market Rate
The prevailing interest rate available in the marketplace for loans, savings, and investments, also reflecting the cost of borrowing money.
Weighted Average Cost
The calculation that takes into account the varying costs of goods and the quantity of each, to determine an average cost.
Preferred Stock
A class of stock that typically has a priority claim on dividends and assets in the event of liquidation over common stock.
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