Mashaal Masha
Value Frequency
1 $a$
2 2$a$
3 3$a$
4 2$a$
5 $a$
The frequency distribution above summarizes a set of data, where $a$ is a positive integer. How much greater is the mean of the set of data than the median?
Difficulty: Hard
A: 

0

B: 

1

C: 

2

D: 

3

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