Find the value of f1 from the following data if it's mode is 65:

Class          frequency

0-20                6

20-40             8

40-60           f1

60-80           12

80-100         6

100-120       5

Where frequency 6,8, f1, and 12 are in ascending order. 

 

Class Frequency
0-206
20-408
40-60f1
60-8012
80-1006
100-1205

 

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