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Observe the following frequency polygon and write the answers of the questions below it.

i. Which class has the maximum number of students? 

ii. Write the classes having zero frequency. 

iii. What is the class mark of the class, having frequency of 50 students? 

iv. Write the lower and upper class limits of the class whose class mark is 85. 

v. How many students are in the class 80 – 90?

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i. The class 60 – 70 has the maximum number of students. 

ii. The classes 20 – 30 and 90 – 100 have frequency zero. 

iii. The class mark of the class having 50 students is 55. 

iv. The lower and upper class limits of the class having class mark 85 are 80 and 90 respectively

v. There are 15 students in the class 80 – 90.

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