A high school conducted a survey to find out the number of hours students spend on homework each week. The results are summarized in the table below:
Hours | Number of Students |
---|---|
1-5 | 10 |
6-10 | 15 |
11-15 | 7 |
16-20 | 8 |
Using this data, calculate the total number of hours spent on homework by the surveyed students.