In the formula bar{x} = frac{Sigma f_{i} x_{i | vedclass

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(C) The formula $\bar{x} = \frac{\Sigma f_{i} x_{i}}{\Sigma f_{i}}$ is used to calculate the arithmetic mean of grouped data.In this formula,$f_{i}$ r

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sum of the frequencies of all the classes

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(C) The formula $\bar{x} = \frac{\Sigma f_{i} x_{i}}{\Sigma f_{i}}$ is used to calculate the arithmetic mean of grouped data.In this formula,$f_{i}$ represents the frequency of the $i$-th class interval,and $x_{i}$ represents the class mark (mid-value) of the $i$-th class interval.The symbol $\Sigma$ denotes the summation.Therefore,$\Sigma f_{i}$ represents the sum of the frequencies of all the classes,which is often denoted by $N$.

Marks	$10-20$	$20-30$	$30-40$	$40-50$	$50-60$
Number of students	$2$	$4$	$7$	$6$	$1$

In the formula $\bar{x} = \frac{\Sigma f_{i} x_{i}}{\Sigma f_{i}}$,$\Sigma f_{i}$ represents ........

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