The table below shows the high temperatures in Houston, Texas, for four days of a five-day period.
| Monday | Tuesday | Wednesday | Thursday | Friday | |
|---|---|---|---|---|---|
| High temperature | 68 | 65 | 72 | 70 | ? |
| Low temperature | 45 | 42 | 48 | 47 | 50 |
If the mean high temperature for the entire five-day period (Monday to Friday) was 70 degrees Fahrenheit, what was the high temperature on Friday?
65
70
75
80
