NCERT Mathematics Class 9 Exemplar Ch 14 Statistics and Probability Part 9
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Q.5. Convert the given frequency distribution into a continuous grouped frequency distribution:
Class interval  Frequency 












In which intervals would and be included?
Answer:
Class intervals  Frequency 












153.5 is included in the class interval and in .
Q.6. The expenditure of a family on different heads in a month is given below:
Head  Food  Education  Clothing  House Rent  Others  Savings 
Expenditure (in Rs) 






Draw a bar graph to represent the data above.
Q.7. Expenditure on Education of a country during a five year period in crores of rupees is given below:
Elementary education 

Secondary Education 

University Education 

Teacher’s Training 

Social Education 

Other Educational Programmes 

Cultural programmes 

Technical Education 

Represent the information above by a bar graph.
Q.8. The following table gives the frequencies of most commonly used letters a , e, i, o , r , t, u from a page of a book :
Letters  a  e  i  o  r  t  u 
Frequency  75  125  80  70  80  95  75 
Represent the information above by a bar graph.
Q.9. If the mean of the following data is 20.2, find the value of p:
X  10  15  20  25  30 
f  6  8  p  10  6 
Answer: 20