The modal class of a frequency distribution is $20-24$. Then,in the calculations of mode,$l=$ ..........

In the formula $Z = l + \left( \frac{f_{1} - f_{0}}{2f_{1} - f_{0} - f_{2}} \right) \times c$ for the mode,$f_{0} = \ldots \ldots \ldots$

The frequency distribution table of agricultural holdings in a village is given below:

Area of land (in hectares)	$1-3$	$3-5$	$5-7$	$7-9$	$9-11$	$11-13$
Number of families	$20$	$45$	$80$	$55$	$40$	$12$

Find the modal agricultural holdings of the village (in hectares).

Find the mode of the following frequency distribution:

Class	$0-100$	$100-200$	$200-300$	$300-400$	$400-500$	$500-600$
Frequency	$7$	$21$	$37$	$13$	$12$	$10$

Find the mode of the following frequency distribution:

Class	$0-20$	$20-40$	$40-60$	$60-80$	$80-100$	$100-120$
Frequency	$8$	$9$	$26$	$23$	$20$	$14$

The formula to find the mode of a grouped data is $\ldots \ldots \ldots . . .$