Question: The question is attached below. The answer is supposed to be 2590, but I'm not sure how to get there. Would appreciate a step by

The question is attached below. The answer is supposed to be 2590, but I'm not sure how to get there. Would appreciate a step by step response to understand how we can use the info given (particularly the 2458 mean). Thanks!

(2 point) While analyzing their annual sales data (liters of wine sold per year) for the past 30 years, a vineyard found that after taking four successive differences, the resulting data had a mean of 2458 liters and loolaed like a stationary process (e.g. white noise). If the actual data for the past four years were 2018 2134 liters, 2017 - 2403 liters, 2016 2076 liters, and 2015 2290 liters. What would be a reasonable forecast for sales in 2019? Explain

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