The bar graph shows the distribution of the number of calls received by a call center per hour during an 8-hour shift.
Hourly Call Volume
| Hour of Shift | Number of Calls |
|---|---|
| 1 | 5 |
| 2 | 8 |
| 3 | 12 |
| 4 | 10 |
| 5 | 7 |
| 6 | 4 |
| 7 | 2 |
| 8 | 0 |
What is the median number of calls received per hour during this shift?
5
6
7
8
