Scene 1

Q1) Observe the following frequency polygon & write the answers 
of the questions?

Scale
X—Axis: I cm=2 marks
Y—Axis : 1 cm = 10 students
(55, 50)
(45, 40)
-z
(35, 20)
60
so
40
30
20
10
20
lx' Y'
30
40
(65, 60)
50 60 70
Marks
fig 6.6
(75, 35)
(85, 15)
80 90 100

Scene 2

1) Which class has the maximum number of students? 
 
Ans: Class 60 – 70 have the maximum frequency i.e. 60. 
 
2) Write the classes having the zero frequency? 
 
Ans: Class 20 – 30 & Class 90 – 100 have zero frequencies.  
 
3) What is the class mark of the class, having frequency of 50 
students? 
 
Ans: The class mark is 55 that has frequency 50.   
 
4) Write the lower & upper limits of the class whose class mark is 
85? 
 
Ans: The class 80 – 90 has class mark 85,  
 
Thus, the lower limit of the class 80 – 90 = 80

& the upper limit of the class 80 -90 = 90

5) How many students are in the class 80 – 90? 
 
Ans: 15 students are their in the class 80 – 90.

Scene 3

Q2) Show the following data by a frequency polygon? 
 
Electricity 
(In Rs)

– 200 – 0  
– 100  
0 
(– 100, 0)

Scene 4

Q3) The following table shows the classification of percentages of 
marks of students & the number of students. Draw the frequency 
polygon from the table? 
 
Result  
(Percentage)

PST6.5

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