Statistics notes
OpenThe 4 formulas you need for Statistics, on one page.
For explanations and lectures, see the full topic page. Then test yourself with 9 JEE Main 2026 PYQs.
Maths · printable
Statistics: One-Page Formula Sheet
Print it or save it as a PDF. It fits on one page.
Last updated: 26 October 2026
Formula sheet
Statistics formulas
Statistics — formula sheet
Formulas
- σ² = (Σxᵢ²/n) − x̄²
- Mean deviation about mean = Σ|xᵢ − x̄|/n
- Coefficient of variation = σ/x̄ × 100
- New variance after y = ax + b: a²σ²
Key ideas
- Adding a constant changes mean but not variance
- Multiplying by k multiplies SD by |k|
- Variance = mean of squares − square of mean
- Combined mean and variance of two groups
Traps to avoid
- Changing variance when adding a constant
- Using n − 1 (JEE uses n)
- Wrong combined variance formula
jeevisionary.in/jee-topics/maths/statistics/
FAQs
Frequently asked questions
Where can I get a Statistics formula sheet PDF for free?
On this page. Use the print button and choose 'Save as PDF'.
How should I use a formula sheet?
Read it once a day for a week, then cover it and write the formulas from memory. Revise only the ones you missed.