Simply owning the book doesn’t guarantee marks. Here is the 3-Phase Strategy for Class 11 students using this textbook:
| Chapter No. | Chapter Name | Key Topics | |-------------|----------------|----------------| | 1 | What is Economics? | Types of economics (micro, macro), positive & normative, economic agents | | 2 | Collection of Data | Primary & secondary data, methods of collection, questionnaires, census vs sample | | 3 | Census and Sample Methods of Collection of Data | Sampling methods (random, stratified, systematic, etc.), sampling errors | | 4 | Organisation of Data | Classification, raw data, frequency distribution, exclusive/inclusive series | | 5 | Presentation of Data – Textual & Tabular | Parts of a table, types of tables, textual presentation | | 6 | Diagrammatic Presentation | Bar diagrams, pie charts, histograms, frequency polygon, ogive | | 7 | Measures of Central Tendency – Arithmetic Mean | Simple & weighted mean, combined mean, step deviation method | | 8 | Measures of Central Tendency – Median and Mode | Median (individual, discrete, continuous), mode (grouping method), empirical relation | | 9 | Measures of Dispersion | Range, quartile deviation, mean deviation, standard deviation, coefficient of variation | | 10 | Correlation | Types of correlation, scatter diagram, Karl Pearson’s coefficient, Spearman’s rank | | 11 | Index Numbers | Simple & weighted index numbers, Laspeyre’s, Paasche’s, Fisher’s, consumer price index | | 12 | Uses of Statistics in Economics | Limitations of statistics, importance in economic planning, policy making |
✅ Also includes: Practice papers, value-based questions, and CBSE sample paper solutions. Sandeep Garg Statistics Class 11
Question:
Calculate the arithmetic mean from the following data:
| Marks | 0–10 | 10–20 | 20–30 | 30–40 | 40–50 | |-------|------|-------|-------|-------|-------| | Students | 5 | 8 | 12 | 7 | 3 | Simply owning the book doesn’t guarantee marks
Solution (as per Sandeep Garg method):
| Class Interval | Mid-value (x) | Frequency (f) | f × x | |----------------|---------------|---------------|--------| | 0–10 | 5 | 5 | 25 | | 10–20 | 15 | 8 | 120 | | 20–30 | 25 | 12 | 300 | | 30–40 | 35 | 7 | 245 | | 40–50 | 45 | 3 | 135 | | Total | | Σf = 35 | Σfx = 825 | your graph will be wrong.
[ \barx = \frac\sum fx\sum f = \frac82535 = 23.57 ]
Answer: Arithmetic Mean = 23.57 marks
Unlike foreign authors who write for a global audience, Sandeep Garg writes specifically for the CBSE Indian student. Every chapter strictly follows the latest CBSE marking scheme. You won’t find irrelevant international data or obsolete methods here.