Question

In step deviation method what is ui ?

Answer 1

Formula for step deviation method = A + ∑fiui÷ ∑fi × h
Where :
A = assume mean
ui = $\frac{xi-a}{h}$
∑ = total frequency 
∑fiui = f1u1 + f2u2 ........fnun.
h = length of the class interval.

∴ui = $\frac{xi-a}{h}$

Answer 2

The step deviation method formula is ;

                   A + h [∑ui fi / ∑fi ]

Step-by-step explanation:

• A is the assumed mean

• h is the class size

• Ui=di/h
• fi is the frequency
• di = xi - A
• xi is the midpoint of the class interval