Median and Mean

The median of the list n; n+3, n+4; n+5; n+6; n+8; n+10; n+12; n+15 is 10. What is the mean? What is the median and what is the mean? There are 9 numbers, and the median is the 5th number n+6. Compare each number with the median, the mean is 10+(-6-3-2-1+2+4+6+9)/9=11.