2. (3) - eye color is non-numerical (blue, green, gray, brown, and so on)
3. (2) - mean is the best measure, because the problem statement tells you that you want to compare "the average amount of time". You could argue that the median might more fairly represent a "typical" time spent exercising, but that is not what the question tells you to compare.
4. (4) 0.90. The data has a positive slope, so r > 0. It falls close to a line, so the correlation is closer to 1 than to 0.