Answer: 16
Explanation:
A data point would be 1 on the vertical axis meaning you can simply add everything up.
Data Points:
0-1: 1
1-2: 3
3-4: 1
4-5: 1
5-6: 2
6-7: 4
7-8: 2
8-9: 1
10-11: 1
Sum: 16
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