Weekly sales of Heartland multi-grain bread at the local Whole Foods are provided in the table below. Based on these data, calculate the following. Sales Week 1 2 415 389 3 420 4 382 410 5 16 432 7 405 8 421 a. Forecast for the 9th week using a 3-week weighted moving average, with the weights of 8, 7 and 48 applied to the most recent period): [Select] b. Forecast for the 9th week using a Trend analysis: Select ] c. Calculate the MAD for each forecast (3-week weighted moving average and trend). Based on the MAD calculations, which approach is better and what is its MAD (Select] o DI