Example: Find the mode of the following series 

Size	Frequency	Size	Frequency
5	48	13	52
6	52	14	41
7	56	15	57
8	60	16	63
9	63	17	52
10	57	18	48
11	55	19	40
12	50	—	—

In the above dataset, the numbers with maximum frequency is 9 and 16 both sharing the frequency of 63.