Mode of the data 15, 14, 19, 20, 14, 15, 16, 14, 15, 18, 14, 19, 15, 17, 15 is
14
19
18
15
Arranging the given data in a frequency distribution:
x14151617181920f4511121
x = 15 has the highest frequency, f = 5. Hence the mode is 15.