Please solve part c. Thank you

Homework: Chapter 4 Homework Save Score: 4.55 of 5 pts 17 of 17 (17 complete) HW Score: 74.64%, 25.38 of 34 pts 7x Problem 4.59 Question Help verriariu LI ZI 20 31 20 20 31 24 20 29 a) The forecast for weeks 2 through 10 using exponential smoothing with a = 0.55 and a week 1 initial forecast of 21.0 are (round your responses to two decimal places): Week 1 2 3 4 5 6 7 8 9 10 Demand 21 21 28 37 26 28 37 24 26 29 Forecast 21.0 21.0 21.0 24.85 31.53 28.49 28.22 33.05 28.07 26.93 b) For the forecast developed using exponential smoothing (a = 0.55 and initial forecast 21.0), the MAD = 4.71 sales (round your response to two decimal places). C) For the forecast developed using exponential smoothing (a = 0.55 and initial forecast 21.0), the tracking signal =(round your response to two decimal places). Enter your answer in the answer box and then click Check Answer. All parts showing Clear All Check