Oexam-Oct 12 Show your work in reaching each answer. Answer three (and only three) of the following four (I, II, II, IV) questions below. Answer all required parts of the questions you select. 1. The number of plumbing repair jobs performed by a small firm in each of the last five months is listed below. a. Forecast the number of repair jobs this plumbing firm will perform in October using either the 'most naive' or 'textbook native' methods discussed in class. (choose one of the those methods, not both). b. Use the (unweighted) three period moving average method to forecast the number of repair jobs this firm will perform in October. c. Going back in time to August and September, use the Mean Absolute Deviation (MAD) to determine which method would have provided more accurate forecasts for those months