CBSE-CLASS-X-MATH-CHAPTER-13-14-IMPORTANT-QUESTIONS
CHAPTER 13 STATISTICS & CHAPTER 14 CBSE CLASS 10 MATH IMPORTANT BOARD QUESTIONS Class 10 Statistics Formulas Mean = (Sum of observations) / (Number of observations) Mean (Discrete data) = (Σfᵢxᵢ) / (Σfᵢ) Mean (Step Deviation Method) = a + [ (Σfᵢuᵢ) / (Σfᵢ) ] × h where uᵢ = (xᵢ − a) / h Mean (Assumed Mean Method) = a + (Σfᵢdᵢ) / (Σfᵢ) where dᵢ = xᵢ − a Mean (Grouped data) = (Σfᵢxᵢ) / (Σfᵢ) Median (Ungrouped data) = value of (n+1)/2 th observation Median (Grouped data) = l + [ ( (n/2 − cf) / f ) × h ] Mode (Grouped data) = l + [ ( (f₁ − f₀) / (2f₁ − f₀ − f₂) ) × h ] Relation between Mean, Median and Mode: Mode = 3Median − 2Mean Cumulative Frequency (Less than type) C.F. = Previous C.F. + frequency Class Mark (xᵢ) = (Upper limit + Lower limit) / 2 Class Width (h) = Upper limit − Lower limit Mean Median Mode F...