Hmm, this seems like a straightforward statistics problem. I just need to look at the forecast data and calculate the mean absolute deviation. I'm pretty sure the answer is C) 3, but I'll double-check my work just to be sure.
The mean absolute deviation is a measure of the average absolute difference between the forecast values and the actual values. Since the question provides the forecast data, I can calculate the mean absolute deviation myself and determine that the correct answer is C) 3.
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