Consider the following time series data. Week 1 2 3 4 5 6 Value 17 14 15 12 16 15 Using the average of all the historical data as a forecast for the next period, compute the following measures of forecast accuracy (Round your answers to two decimal place) (a) mean absolute error MAE-24 (b) mean squared error MSE-72 x x (c) mean absolute percentage error MAPE 04 x% (d) What is the forecast for week 77 14.03