(1) Which class has the maximum number of students?
Solution:
Class 60-70 has maximum number of students
(2) Write the classes having zero frequency.
Solution:
Class 20-30 and class 90-100 have zero frequency
(3) What is the class-mark of the class, having frequency of 50 students?
Solution:
Frequency 50 students is for class 50-60
Class mark for this class is 55
(4) Write the lower and upper-class limits of the class whose class mark is 85.
Solution:
Class mark is 85 for class 80-90
Lower limit = 80
Upper limit = 90
(5) How many students are in the class 80-90?
Solution:
There are 15 students in class 80-90