When the distribution has outliers. They will skew the mean but will not affect the median.
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The mean is 1226.75. The median is 508. There is no mode as no number occurs more than any other.
If the distribution is not symmetric, the mean will be different from the median. A negatively skewed distribution will have a mean hat is smaller than the median, provided it is unimodal.
Generally, when the median is greater than the mean it is because the distribution is skewed to the left. This results in outliers or values further below the median than above the median which results in a lower mean value than median value. When a distribution is skewed left, it is generally not very symmetrical or normally distributed.
When you have a line of numbers such as 1,2,3,3,4,6,7 that go in a relative order rather than numbers such as 1,2,6,6,7,12,14,20 that jump around more.
No and a single number cannot have a median either you need a series (at least two) to have a median.