To find the median order the numbers and see which one is in the middle of the list. The median is the center. First add the numbers up.
To find the mean add all the numbers in the set together then divide them by the amount of numbers in the set.
The mean median and mode can all be called an average in certain literature but using their proper technical names is recommended to avoid confusion. For the range subtract the lowest number from the highest number. Then find the median by picking the middle number. Adding arithmetic also helps since there is a geometric mean a harmonic mean a geometric median.