Mode of value inside a modal class =  $l$ + $({f_1-f_0}/{2f_1-f_0-f_2})× h$
     
	       where   $l$ =  lower limit of the modal class,
				$h$ =  size of the class interval (assuming all class sizes to be equal),
				$f_1$  =  frequency of the modal class,
				$f_0$  =  frequency of the class preceding the modal class,
				$f_2$  =  frequency of the class succeeding the modal class.