D. If the professor grades on a curve (for example, the professor could give A's to the top 10% of the class, regardless of the score), is a student better off with a grade of 83 on this exam or a grade of 75 on a different exam, where the mean is 67 and the standard deviation is 4? Show your answer statistically and explain. A student is better off or worse off with a grade of 83 on this exam because the Z value for the grade of 83 is ___ and the Z value for the grade of 75 is ___.
(Round to two decimal places as needed.)