please answer the last blank

Problem 4.6 s Question Help The monthly sales for Yazici Batteries, Inc., were as follows: Jul Month Sales Jan 19 Feb 23 Mar 15 Apr 14 May 15 Jun 15 Aug Sept 19 19 Oct 22 Nov 21 Dec 23 17 This exercise contains only parts b and c. b) The forecast for the next month (Jan) using the naive method = 23 sales (round your response to a whole number). The forecast for the next period (Jan) using a 3-month moving average approach = 22 sales (round your response to two decimal places). The forecast for the next period (Jan) using a 6-month weighted average with weights of 0.10, 0.10, 0.10, 0.20, 0.20, and 0.30, where the heaviest weights are applied to the most recent month = 21 sales (round your response to one decimal place). Using exponential smoothing with a = 0.40 and a September forecast of 20.00, the forecast for the next period (Jan) = 21.59 sales (round your response to two decimal places). Using a method of trend projection, the forecast for the next month (Jan) = sales (round your response to two decimal places)