You are given the following actual demand values for the past 18 months. Using the three month moving average forecasting technique, determine the forecast for time period 19 (December): Month June Time Period Actual Demand 1 58 2 52 July August September October November December January February March 3 45 55 58 47 9 46 7 55 00 9 57 47 10 53 April 11 42 May 12 45 June 13 52 July 14 47 August 15 42 September 16 46 October 17 52 November 18 57 46.57 46.67 000 57 51.67