NCERT Mathematics Class 9 Exemplar Ch 14 Statistics and Probability Part 13
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Exercise 14.4
Q.1. The following are the marks (out of 100) of 60 students in mathematics.
Construct a grouped frequency distribution table with width of each class starting from .
Answer:
Class 










Frequency  1  2  5  6  3  4  3  2  5  4 
Q.2. Refer to Q1 above. Construct a grouped frequency distribution table with width 10 of each class, in such a way that one of the classes is 10  20 (20 not included).
Answer:
Class intervals  Frequency 
 4 
 7 
 5 
 10 
 5 
 8 
 5 
 8 
 5 
 3 
Q.3. Draw a histogram of the following distribution:
Heights (in cm)  Number of students 
 7 
 8 
 14 
 10 
 6 
 5 
Q.4. Draw a histogram to represent the following grouped frequency distribution:
Ages (in years)  Number of teachers 
 10 
 28 
 32 
 48 
 50 
 35 
 12 