2014 · Q99
What is Σ fᵢ(xᵢ − x̄) equal to, where x̄ is the arithmetic mean of the frequency distribution?
Elementary MathematicsStatistics
- A0
- B−1
- C1
- D2
Explanation
Σfᵢ(xᵢ − x̄) = Σfᵢxᵢ − x̄Σfᵢ = x̄Σfᵢ − x̄Σfᵢ = 0.
What is Σ fᵢ(xᵢ − x̄) equal to, where x̄ is the arithmetic mean of the frequency distribution?
Explanation
Σfᵢ(xᵢ − x̄) = Σfᵢxᵢ − x̄Σfᵢ = x̄Σfᵢ − x̄Σfᵢ = 0.