Answer:
Normal distribution.
Median is 5.5.
Range is 8.
Explanation:
The given distribution is a normal distribution because it's symmetrical.
The median is the value in the middle. There are 28 elements, so, the median is between the 14th and 15th element, that is:

So, the median is 5.5.
The range is the difference between the greatest value and the least, which is

Therefore, the range is 8.