Here are the errors associated with a particular forecast over the past five months, in chronological order: 5, 10, -10, 0, 10. Which of the following statements is (are) true? I. The mean absolute...

Extracted text: Here are the errors associated with a particular forecast over the past five months, in chronological order: 5, 10, -10, 0, 10. Which of the following statements is (are) true? I. The mean absolute deviation (MAD) over these five months is 3. II. The forecast was too low during the third month. II. The forecast was perfectly accurate during one of the months. T only. Il and II I, Il and III Ill only. I and II