A retailer is looking at the number of on-line orders for one particular product. Over the last 8 weeks the sales have been as follows: WEEK SALES 1 657 2 563 3 691 4 431 5 576 6 529 7 627 8 486 Compute a 3-week weighted moving average to forecast this data using weights of 4, 3 and 2. The mean square error (MSE) for the forecast is (provide your answer to the nearest two decimal places)

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