you add 3 then subtract7
n + 20 - 17 + 13 - n = 20 - 17 + 13 = 3 + 13 = 16
13
10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20
Median = 15
The median of {10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20] is the 6th values which is 15.
11- undecagon 12- dodecagon 13- 13-gon 14- 14-gon 15- 15-gon 16- 16-gon 17- 17-gon 18- 18-gon 19- 19-gon 20- 20-gon
5
13
18-the correct number should be 20.
(10 + 13 - 7 + 5 - 2 + 8 - 16 + 4 + 20 - 1)/2
To find the median of the numbers 12, 13, 14, 15, 16, 17, 18, 19, 20, and 21, first, arrange them in order (they are already sorted). Since there are 10 numbers (an even count), the median is the average of the two middle numbers, which are 16 and 17. The median is therefore (16 + 17) / 2 = 16.5.
10, 11, 12, 13, 14, 15, 16, 17, 18, 19, and 20