Solutions for Class 11 by T.R. Jain and V.K. Ohri Statistics for Economics Chapter 4 – Data Organization is a critical principle that students should study thoroughly. T.R. Jain and V.K. Ohri Solutions for Class 11 are available here.
| Board | CBSE |
| Class | Class 11 |
| Subject | Statistics for Economics |
| Chapter | Chapter 4 |
| Chapter Name | Organisation of Data |
| Number of questions solved | 02 |
| Category | T.R. Jain and V.K. Ohri |
T.R. Jain and V.K. Ohri Solutions for Class 11 Statistics for Economics Chapter 4 – Organisation of Data
Question 1
Convert the following cumulative frequency series into a simple frequency series:
- 4 students obtained less than 10 marks
- 20 students obtained less than 20 marks
- 40 students obtained less than 30 marks
- 48 students obtained less than 40 marks
- 50 students obtained less than 50 marks
Solution:
Conversion of cumulative frequency series into a simple frequency series
| Cumulative Frequency Series | Simple Frequency Series | ||
| Marks less than | Number of students | Marks | Number of students |
| 10 | 4 | 0-10 | 4 |
| 20 | 20 | 10-20 | 20-4 = 16 |
| 30 | 40 | 20-30 | 40-20 = 20 |
| 40 | 48 | 30-40 | 48-40 = 8 |
| 50 | 50 | 40-50 | 50-48 = 2 |
Question 2
30 Students of Class XI obtained following marks in economics. Classify the data in the form of individual series, discrete series, continuous series and cumulative frequency series.
| 24 | 16 | 22 | 20 | 16 | 18 | 19 | 17 | 25 | 18 | 24 | 20 | 16 | 15 | 22 |
| 20 | 21 | 23 | 18 | 22 | 25 | 22 | 15 | 24 | 15 | 25 | 18 | 25 | 15 | 20 |
Solution:
Individual series:
| 15 | 15 | 15 | 15 | 16 | 16 | 16 | 17 | 18 | 18 | 18 | 18 | 19 | 20 | 20 |
| 20 | 21 | 22 | 22 | 22 | 22 | 23 | 24 | 24 | 24 | 25 | 25 | 25 | 25 | 25 |
Cumulative frequency series:
| Marks | No. of Students | Marks | No. of Students |
| Less than 15 | 0 | More than 12 | 30 |
| Less than 19 | 9 + 4 =13 | More than 16 | 30 – 4 =26 |
| Less than 23 | 13 + 9 =22 | More than 20 | 26 – 9 =17 |
| Less than 27 | 22 + 8 = 30 | More than 24 | 17 – 9 =8 |
0 Comments