a. What is the forecast for month 6 using a naive forecast? [5 marks] b. Using a three-week simple moving average, what is the forecast for month 6 ? [t marks] c. If a three-week weighted moving average were used, what would be the forecast for month 6 . (The weights are 0.50 , o. 0 , and 0.20 with 0.50 applied to the most recent period and 0.20 applied to the oidest period.) (5 marka] d. What is the exponentially smoothed forecast for month week a 6 if d=0.8 is uoed, and the forecast for week af was 105