please answer all 3 questions

#17 the answer is not 6.51

QUESTION 5 See chapter 18, page 477, problem 6 a. What is the forecast for February, using exponential smoothing technique, with a = 0.2? Data Actual Forecast 80 January February March April May 100 94 106 80 68 94 June QUESTION 11 See chapter 18 page 479, problem 15e Use x values of through 6 for the months an through June, and the corresponding demands as y values Find the regression line of the y values over Using this line, what is the forecast for Data Demand 12 11 January February March April My 15 12 16 June 15 QUESTION 17 The forecasts in the last four periods were 10,25,32 and 21 unit. The actual demands were 10, 28, 37, and 21 units. What is the mean absolute devotion for this forecast provide two decimal places