The table below shows the average daily temperatures (in degrees Fahrenheit) for two cities over a 6-day period.
City X: 68.5, 72.1, 69.3, 70.8, 71.5, 67.9
City Y: 75.2, 73.8, 76.1, 74.5, 72.9, 75.0
What is the positive difference between the median daily temperature for City Y and City X, to the nearest tenth of a degree Fahrenheit?