In the formula bar{x} = a + h left( frac{Sigm | vedclass

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(B) The given formula $\bar{x} = a + h \left( \frac{\Sigma f_{i} u_{i}}{\Sigma f_{i}} \right)$ is the step-deviation method formula for calculating th

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$\frac{x_{i} - a}{h}$

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(B) The given formula $\bar{x} = a + h \left( \frac{\Sigma f_{i} u_{i}}{\Sigma f_{i}} \right)$ is the step-deviation method formula for calculating the mean of a grouped frequency distribution.In this formula,$a$ represents the assumed mean,$h$ represents the class size,$x_{i}$ represents the class mark,and $u_{i}$ is defined as the deviation divided by the class size.Therefore,the expression for $u_{i}$ is $u_{i} = \frac{x_{i} - a}{h}$.

Income (in $Rs.$)	$1-200$	$201-400$	$401-600$	$601-800$
Number of employees	$14$	$15$	$14$	$7$

In the formula $\bar{x} = a + h \left( \frac{\Sigma f_{i} u_{i}}{\Sigma f_{i}} \right)$,for finding the mean of grouped frequency distribution,$u_{i}$ is equal to

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