Given forecast errors of 4,8 , and -3 , what is the mean absolute deviation? A) 4 B) 6 C) 5 D) 12 E) 3 A concert promoter is torecasting this year's attendance tor one of his concerts based on the following historical data: The previous trend line had predicted 18,500 for two years ago, and 19,700 for last year. What was the mean absolute deviation for these forecasts? A) 500 B) 100 C) 200 D) 800 E) 400