Different ways to define the average.
Explanation
Mean - what is commonly referred to as average. Dividing the sum of revenue by the count of order
Median - the middle value. Line all orders up by size and what's the value of the middle order.
Most - the most frequently occurring value.
So let's say we 11 order with the following values:
20
20
20
20
26
32
32
45
60
90
120
In this case, we would have the following results:
Mean = 485/10 = 44.1
Median = 32 (the sixth highest value)
Mode = 20 (the most frequently occurring -> 4 times)