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Could you give them a list of the grades that they have earned so far this quarter and have them find the mean, median, and mode relating to their individual grade? Ex) you give "Joe" the grades that he earned so far this quarter. "Joe" has to find the mean (average) of all of his grades. He also needs to find the median and mode. This is a great chance for the students to practice with mean, median, and mode, a great chance to relate it to real life, and a great chance for the students to see how they are doing thus far...just make sure that they aren't comparing the results with other students.
You could also do the same activity, but use something different. Like data collected from an experiment. You could bring science into math by having them find the mean, mode, and median of their results of a recent science experiment.
Good luck!