Find the mode, if any, for each of the following data sets. For the data sets that have modes, state whether the data set is unimodal, bimodal, or multimodal.
1. 15, 33, 30, 50, 0
2. -4, 25, -4, 11, 19, 4
3. 4.7, 5.6, 2.5, 4.9, 7.3, 4.7, 5.6, 6.5
4. -10, 0, 3, 3, 6, 16
5. 150, 330, 300, 500, 0
6. 0, 0, 0, 100, 100, 100
7. 50, 50, 50, 50, 50, 50, 50
8. 30, 40, 50, 50, 60, 70
9. -30, -40, -50, -50, -60, -70
10. 1, 1, 4, 4, 4, 10, 10, 10