What is the difference between the mean and median of the first four prime numbers that are more than 4?

Answer 1

well, the numbers are 5,7,11,13

I'm sure you can figure the mean and median.

Answer 2

Mean=9
Median=11
Is it right?
Then the difference between them is -2.
But here in the answer sheet the ans is 0!!im really confused

Answer 3

since there is an even number of values, the median is the average of the two center values: 9, not 11