Question: Given the following forecasting data, using trend projection, the sum of deviations from the mean for x and y . jpg is _ _ _

Given the following forecasting data, using trend projection, the sum of deviations from the mean for x and y.jpg is ______________.
Month
Period
Demand (in Thousands)
April
1
19
May
2
20
June
3
18
July
4
19
August
5
17

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