To use the book effectively, you cannot read it like a novel. Here is your strategic guide to the 9 core chapters.
Even with a great book, students slip up. Here is what to avoid:
| Mistake | Solution | | :--- | :--- | | Skipping the "True/False" section | These often appear as 1-mark assertion-reason questions. Do all objective questions. | | Memorizing formulas without logic | Write down the derivation of Mean (Step Deviation method) at least once. | | Ignoring diagrams | Practice drawing Histograms and Frequency Polygons on graph paper. Externals check neatness. | | Only reading, not solving | Economics numericals require muscle memory. Solve every unsolved question at the back. |
Week 1: Chapters 1 & 2 (What is Statistics? Collection of Data). Focus on definitions and sampling methods.
Week 2: Chapters 3 & 4 (Census, Sample, Organisation). Learn the difference between Exclusive and Inclusive series. Sandeep Garg Statistics Class 11
Week 3: Chapters 5, 6, 7 (Crucial week). Dedicate 2 hours daily to Mean, Median, Mode. Use a calculator but write every step.
Week 4: Chapters 8, 9, 10 (Dispersion, Correlation, Index Numbers). These are advanced. Do not rush—watch YouTube tutorials alongside the book.
Last 3 days: Solve 2 sample papers strictly in 3 hours. Compare your answers with the Sandeep Garg solution guide.
Chapter 1: Introduction to Statistics
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 |
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 | To use the book effectively, you cannot read it like a novel
[ \barx = \frac\sum fx\sum f = \frac82535 = 23.57 ]
Answer: Arithmetic Mean = 23.57 marks
The book is famous for its exhaustive question bank. It includes: