Given the following data,compute the mean squared error (deviation). 
Definitions:
Interest Rate
The percentage of a sum of money charged for its use, reflecting the cost of borrowing or the return on saving.
Managed Mutual Funds
Investment funds that are operated by professional fund managers who allocate the fund's investments and attempt to produce capital gains for the fund's investors.
Stock Index
A measure designed to track the performance of a group of stocks, representing a specific segment of the market.
Random Walk
A theory in finance suggesting that stock market prices follow an unpredictable path, making it impossible to predict future movements based on past trends.
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