The following data show the number of times different students of a class practice karate in a week:

4, 6, 7, 3, 4, 4, 2, 5, 4, 3, 1, 2, 5, 2, 3, 5, 1, 3, 2

the dot plot below was made to represent the data.

a box plot showing 2 dots over 1, 4 dots over 2, 4 dots over 3, 4 dots over 4, 4 dots over 5, 1 dot over 6, and 1 dot over 7

for which number is the data plotted incorrectly?

1
3
4
5