18.33
(To find the average, add all of the numbers together and then divide by the number of numbers there are)
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7
The average of these numbers is 12.7You calculate this by adding all the numbers up (which in this case equals 254) and then divide by the total number of numbers (which in this case is 20 numbers) 254 divided by 20 equals 12.7
The median is 20, as it is the middle number when they are all listed in order.
16.5 is the median.
I really think you can do this. 13, 14, 15, 16, 17, 18, 19, 20...