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If you were examining the graphs of a class (for example: ages of students in a class), which would be more meaningful the mean, median or mode?

1. If you were examining the graphs of a class (for example: ages of students in a class), which would be more meaningful the mean, median or mode? Explain.
2. In calculating means, medians, etc. What is the importance of the number of samples?
3. How might graphs be constructed so as to appear to show a trend, etc. that is not really inherent in the data?