A study of hours devoted to a graduate course outside of classroom time generates a mean score of 90 with a standard deviation of 20. The mean age of the students was 31 with a standard deviation of 5 years. What is the relative dispersion of the two data sets?
A. 2.22%; 1.6%
B. 22.22%; 16.13%
C. 34.44%; 20%
D. Not calculable without additional data