For the dot plot
We have the next data
11,16,11,15,9,10,11,13,15,17,10,14,17,10,13,15,11,12,12,12,11,12,14,15,15,13,10,15,12,11
we have 30 numbers
in order to create a dot plot we need to add a point every time a value is repeated
Then the frequency table is how many times the values are repeated
values frequency
9-10 5
11-12 11
13-14 5
15-16 7
17-18 2