math
posted by Sam on .
find the midrange of these:
1.5, 2.5, 3.0, 1.0, 1.4, 3.5, 1.8, 1.8, 3.3, 2.2, 2.8, 1.8
I thought you take the highest  the lowest and then divide by 2, but the answer I get is not one of the choices.
Show me the formuula please? Thanks!

"midrange: a rough estimate of the center found by taking the mean of the highest and lowest value in the data set. Symbol: MR"
http://personal.jccmi.edu/TuckeyAlanaJ/portfolio/APRP/133_win02_ch3notes.htm 
Thanks! I took it to mean I add, I was minusing! It made a world of difference