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14. Assume that the midterm exam can only be graded using four possible grades: 50%, 70%, 85%, and 100%. There are 100 people in this

14. Assume that the midterm exam can only be graded using four possible grades: 50%, 70%, 85%, and 100%. There are 100 people in this class. 25 people received a grade of 50%. 40 people received a grade of 70%. 30 people received a grade of 85%. And 5 persons received a grade of 100%. What is the MEAN of the distribution

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