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For the following data, what is the 3-period moving average forecast for the 9th period? Period Actual 1 12 2 14 3 13 4 15

For the following data, what is the 3-period moving average forecast for the 9th period? Period Actual 1 12 2 14 3 13 4 15 5 17 6 18 7 15 8 20

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