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$$ 6,13,5,16,a,15,9 $$
In the list of values shown above; $ a $ is an integer, the median is $ 9 $, and a mode exists.
Which of the following is a true statement about this list of values?
The mode could be greater than the median.
The mode could be greater than the mean.
The mode could be equal to the median.
The median could be equal to the mean.