Consider one organisation you are familiar with that plays a role in the global supply chain network. This organisation can be a supplier, manufacturer, distributor, logistics service provider or retailer in a particular industry (e.g. fast-moving consumer goods, electronics, oil and gas, and pharmaceuticals). (a) How is demand forecasting essential for this organisation and what is its impact on inventory management? (5 marks) (b) Assume the following organisation's actual sales data for the past six months is shown below. Compute the demand for the seventh month using a regression method with the SLOPE of 30 and INTERCEPT of 290. Calculate the Mean Absolute Deviation (MAD) and Mean Absolute Percent Error (MAPE)