The following table shows demand of a retailer in previous years. t 1 2 3 4 5 6 7 8 9 O a. 40.98 O b. 196.88 O c. 5.5 O d. 245.88 Demand 54 60 58 66 60 70 72 68 77 If we use a simple moving average with N=3 to predict the demand for periods 4 to 9, what would be the mean squared error?

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