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Mode is the number that occurs most case of grouped data mode can be determined by following formula.

mode = L + ( \frac{F1 - F0}{2F1-F0-f2}) * H

modal class= class that has more number of frequency
L = the lower limit of modal class
F1 = frequency of modal class  
F0= frequency of class preceding the modal class
F2=frequency of class succeeding the modal class
H=size of class intervals
1 5 1
Mode is that frequency that occurs most of the time