To answer this question, we need to find the number of goals for 0, 1, 2, 3, 4, and 5. Frequency, in this case, is the number of times the event "goal' occurs. Then, we have that, if we carefully see the table, we have that:
0 goals ---> 7 observations (this event happened 7 times.)
1 goal ---> 15 observations (this event happened 15 times.)
2 goals ---> 4 observations (this event happened 4 times.)
3 goals ---> 4 observations (this event happened 4 times.)
4 goals ---> 0 observations (this event happened 0 times.)
5 goals ---> 0 observations (this event happened 0 times.)
Then, we have to complete the table as follows (this is the answer):
Goals Frequency
0 7
1 15
2 4
3 4
4 0
5 0