The histogram below summarizes the grades (out of 50) of all students who wrote a midterm exam. 45 39 40 35 30 30 24 25 21 21 Number of Students 20 15 12 10 30 35 40 45 50 55 10 15 20 25 Grade a. How many class intervals were used in the histogram?b. How many students wrote midterm exam? c. What is the modal class? (click to select) d. What is the midpoint of the last class interval? e. How many students scored between above 15 but no more than 20?f. What percent of students scored above 40? 96 H 3. What percent of students scored no more than 30? 96 U h. Is it possible to determine individual student grades from this histogram? {click to select} v