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Here are the errors associated with a particular forecast over the past five months, in
chronological order: 2 , 5 , 0 , 5 , 10 . Which of the following statements is (are) true? I. The
forecast was too high during the fifth month. II. The mean error over these five months is 2 III.
The forecast was perfectly accurate during one of the months. a. III only b. I and III c. I only d. I,
II and III e. Il only

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