Generate a frequency table for the following data: 3, 12, 25, 2, 3, 6, 17, 17, 15, 13, 20, 12, 21, 18, 19.
Use the ranges listed in the table below:

Range Number of Values
1 – 5
6 – 10
11 – 15
16 – 20
21 – 25


What value should be placed in the second column for the range 16 – 20?
4