Median Study Hours of Students

In a survey conducted among 100 students, the following data was collected regarding the number of hours they study per week:

5 students reported studying for 0 hours.

20 students reported studying for 1 to 5 hours.

30 students reported studying for 6 to 10 hours.

25 students reported studying for 11 to 15 hours.

10 students reported studying for 16 to 20 hours.

10 students reported studying for more than 20 hours.

Using this data, calculate the median number of hours that the students study per week.