Consider the following time series data. Week 123 4 5 6 Value 19 13 15 11 16 14 Using the average of all the historical data as a forecast for the next period, compute the following. (Round your answers to two decimal places.) (a) mean absolute error MAE-2 (b) mean squared error MSE- x X (c) mean absolute percentage error MAPE (d) What is the forecast for week 77

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