Consider the quarterly demand levels for electricity (1000 megawatts) in Polokwane from 2015 to 2018. Quarter 2015 2016 2017 2018 Jan - March 21 35 39 78 Apr-June 42 54 82 114 July-Sept 60 136 160 Oct-Dec 12 14 28 40 Using the third period moving average Determine the centered moving average of period 15

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