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NCERT Class 9 Maths Textbook Chapter 14 With Answer Book PDF Free Download
Chapter 14: Statistics
14.1 Introduction
Every day we come across a lot of information in the form of facts, numerical figures, tables, graphs, etc.
These are provided by newspapers, televisions, magazines, and other means of communication.
These may relate to cricket batting or bowling averages, profits of a company, temperatures of cities, expenditures in various sectors of a five-year plan, polling results, and so on.
These facts or figures, which are numerical or otherwise, collected with a definite purpose are called data.
Data is the plural form of the Latin word datum. Of course, the word ‘data’ is not new to you. You have studied data and data handling in earlier classes.
Our world is becoming more and more information-oriented. Every part of our lives utilizes data in one form or the other.
So, it becomes essential for us to know how to extract meaningful information from such data. This extraction of meaningful information is studied in a branch of mathematics called Statistics.
The word ‘statistics’ appears to have been derived from the Latin word ‘status’ meaning ‘a (political) state’.
In its origin, statistics was simply the collection of data on different aspects of the life of people, useful to the State.
Over period of time, however, its scope broadened and statistics began to concern itself not only with the collection and presentation of data but also with the interpretation and drawing of inferences from the data.
Statistics deals with the collection, organization, analysis, and interpretation of data. The word ‘statistics’ has different meanings in different contexts.
| Author | NCERT |
| Language | English |
| No. of Pages | 33 |
| PDF Size | 236 KB |
| Category | Mathematics |
| Source/ Credits | ncert.nic.in |
NCERT Solutions Class 9 Maths Chapter 14 Statistics
1. Give five examples of data that you can collect from your day-to-day life.
Solution:
Five examples from day-to-day life:
- The number of students in our class.
- The number of fans in our school.
- Electricity bills of our house for last two years.
- Election results were obtained from television or newspapers.
- Literacy rate figures obtained from Educational Survey
2. Classify the data in Q.1 above as primary or secondary data.
Solution:
Primary data: when the information was collected by the investigator herself or himself with a definite objective in her or his mind, the data obtained is called primary data.
Primary data; (i), (ii) and (iii)
Secondary data; when the information was gathered from a source that already had the information stored, the data obtained is called secondary data
Secondary data; (iv) and (v)
NCERT Class 9 Maths Textbook Chapter 14 With Answer Book PDF Free Download