The table below shows the high and low temperatures in Houston, Texas, during a five-day period.
| Monday | Tuesday | Wednesday | Thursday | Friday | |
|---|---|---|---|---|---|
| High temperature | 70 | 62 | 68 | 75 | 80 |
| Low temperature | 45 | 38 | 42 | 50 | 55 |
What is the average of the daily temperature ranges, in degrees Fahrenheit, for the five-day period?
