The ages of two groups of karate students are shown in the following dot plots: picture shown below:

The mean absolute deviation (MAD) for group A is 2.07 and the MAD for group B is 5.51. Which of the following observations can be made using these data?

Group A has greater variability in the data.
Group A has less variability in the data.
Group B has a lower range.
Group B has a lower mean