The average value is the sum of all numbers divided by the number of numbers.

Median is a number in the middle after a set of numbers are sorted (the number of numbers is odd); Or the average of the middle two numbers (even number). Example: the median of 1, 7, 4, 5, 2, 5 and 8 is 5; The median of 1, 7,4,5,2,5 is (4+5) ÷ 2 = 4.5.