One The following data relating to the demand for a particular book was obtained from the records of Savani's publishers' ltd. Year Quarters I II III IV 2019 440 425 370 390 2020 415 390 355 330 2021 370 330 310 290 2022 355 310 280 245 2023 330 275 230 210 2024 295 260 Required: a) Establish the equation of the trend line using semi-average method (10 Marks) The semi-average method involves splitting the data into two equal parts, calculating the average for each part, and then using these averages to determine the trend line. Step 1: Split the data into two equal parts Since we have data from 2019 to 2024, we can split it into two parts: First part: 2019, 2020, 2021 Second part: 2022, 2023, 2024 Step 2: Calculate the average for each part First part (2019-2021): Average for Quarter I: (440 + 415 + 370) / 3 = 408.33 Average for Quarter II: (425 + 390 + 330) / 3 = 381.67 Average for Quarter III: (370 + 355 + 310) / 3 = 345.00 Average for Quarter IV: (390 + 330 + 290) / 3 = 336.67 Second part (2022-2024): Average for Quarter