4 points In a newsvendor model, the underage cost is $5, the overage cost is $8. Which of the following statements are correct? There may be more than one correct choice. Select ALL that apply. (Difficulty Level - Hard) The optimal order quantity may be either higher than the mean or lower than the mean. The optimal order quantity will be higher than the mean. The critical ratio will be lower than 50%. The optimal order quantity will be lower than the mean. The critical ratio will be higher than 50%