please answer both

Sum oftast demands 0,0.... -0, Simple Moving Avenge Weighted Moving Average who need Di "...W.P.W.P. + -+W. Exponial Sehing Ford *ab,+ (1-a) It is the end of May and you must prepare a forecast for june for a certain product. The forecast for May was 900 units. The actual demand for May was 1000 units, You are using the exponential smoothing method with a = 0.20. The forecast for June falls into which range below? O a greater than or equal to 975 units. Ob.greater than or equal to 950 units but fewer than 975 units. Ocgreater than or equal to 925 units but fewer than 950 units. Od fewer than 925 units QUESTION 35 Which one of the following is most useful for measuring the "biasin a forecast? O a Standard deviation of forecast errors O b. Mean absolute deviation of forecast errors c. Cumulative sum of forecast errors Od. Percentage forecast error in period