02 Filtering on Euro 12

[iamoespana92]

I think the question 9 (### Step 9. Calculate the mean Yellow Cards given per Team) is not clear because the table you get just have unique countries already.

	Team	Yellow Cards	Red Cards
0	Croatia	9	0
1	Czech Republic	7	0
2	Denmark	4	0
3	England	5	0
4	France	6	0
5	Germany	4	0
6	Greece	9	1
7	Italy	16	0
8	Netherlands	5	0
9	Poland	7	1
10	Portugal	12	0
11	Republic of Ireland	6	1
12	Russia	6	0
13	Spain	11	0
14	Sweden	7	0
15	Ukraine	5	0

1. should I compute the mean of yellow cards between yellow and red?
2. should I compute the mean between all countries in the column Yellow Cards?