The document Ex 14.1 NCERT Solutions- Statistics Class 9 Notes | EduRev is a part of the Class 9 Course Class 9 Mathematics by Full Circle.

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**Question 1. Give five examples of data that you can collect from your day-to-day life. Solution:** Following are five examples which are related to day-to-day life:

(i) Number of girl students in our class.

(ii) Number of computer sets in our computer-lab.

(iii) Telephone bills of our house for last two years.

(iv) Number of students appeared in an examination, obtained from newspapers.

(v) Number of female teachers in all the schools in a state obtained from the education department.

**Question 2. Classify the data in Q. 1 above as primary or secondary data. Solution: **We have: Primary data: (i), (ii) and (iii) Secondary data: (iv) and (v)

**PRESENTATION OF DATA REMEMBER**

I . Every group into which the raw data is condensed is called a class-interval.

II . In each of these classes, the least number is called the lower class-limit and the greatest number is called upper class-limit.

III. The difference between the upper limit and the lower limit of a class is called its class size.

IV. The difference between the maximum value and the minimum value of the observation is called the range.

V. The class-mark of a class =

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