Mr. Nussbaum asked the students in the fourth grade about their favorite ice cream flavors. The graph below shows their answers.

How many students chose strawberry?
1. 15
2. 19
3. 18
4. 21
How many students chose vanilla?
1. 17
2. 20
3. 22
4. 27
How mant students chose vanilla or strawberry?
1. 40
2. 42
3. 46
4. 50
How many students chose rocky road or cookie dough?
1. 15
2. 17
3. 19
4. 20
How many students DID NOT choose chocolate?
1. 46
2. 51
3. 54
4. 57
How many more students chose vanilla than strawberry?
1. 7
2. 4
3. 3
4. 6
How many fewer students chose rocky road than chocolate?
1. 19
2. 21
3. 23
4. 25
How many students are there in the third grade?
1. 61
2. 71
3. 81
4. 91