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:

Convert the Given Frequency Distribution into a Continuous Grouped Frequency Distribution
Class intervalFrequency

In which intervals would and be included?

Answer:

153.5 is Included in the Class Interval 153.5 - 157.5 and 157.5 in 157.5 - 161.5
Class intervalsFrequency

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:

The Expenditure of a Family on Different Heads in a Month
HeadFoodEducationClothingHouse RentOthersSavings
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:

Expenditure on Education of a Country During a Five Year Period (2002 - 2006)
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:

Table Gives the Frequencies of Most Commonly Used Letters a , E, I, O , R , T, U from a Page of a Book
Lettersaeiortu
Frequency751258070809575

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:

The Mean of the Following Data is 20.2, Find the Value of P
X1015202530
f68p106

Answer: 20