NCERT Mathematics Class 9 Exemplar Ch 14 Statistics and Probability Part 9 (For CBSE, ICSE, IAS, NET, NRA 2022)
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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 ₹) |
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