The final grades in mathematics of 80 students at State University are recorded in the accompanying table.

With reference to this table, find:

(a) The highest grade.

(b) The lowest grade.

(c) The range.

(d) The grades of the five highest-ranking students.

(e) The grades of the five lowest-ranking students.

( f ) The grade of the student ranking tenth highest.

(g) The number of students who received grades of 75 or higher.

(h) The number of students who received grades below 85.

(i) The percentage of students who received grades higher than 65 but not higher than 85.

( j) The grades that did not appear at all.

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