I think a non- integer rational number but I’m not real sure on that.
I’m pretty sure it’s the way you have it. 360t+1013-12012
if not...someone else will probably tell you the right way
You need to order the data, so
11, 12, 13, 14, 14, 15, 17, 17, 18, 18, 18, 20
Then find the middle of the data. Because there are 12 data points, the median will lie between the two 6th placed numbers
The two numbers are 15 and 17, so work out the mean of them. (15+17)/2 = 16
So the answer is B. 16