MCQ
Equation of mean $X =a+\frac{\Sigma f_i u_i}{\Sigma f_i}$ where $u_i=$ _______
- ✓$\frac{x_i-a}{h}$
- B$x_i-a$
- C$x_i-h$
- D$\frac{x_i-h}{a}$
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