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:

In which intervals would and be included?

Answer:

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
The expenditure of a family on different heads in a month
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:

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

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
X	10	15	20	25	30
f	6	8	p	10	6

Answer: 20