# 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

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