wait a minute, "Mean, Median, Mode, and Range"?
http://www.purplemath.com/modules/meanmode.htm
When a test paper says average it means the basic one were you add everything together and divide it by the number of corresponding parts unless it specifies for a different type.
Should I write this on the paper?
Yes you should.
No, you have to show the work on how you got the 75. Freeze?
Well,
Since in the end you will divide by 6 and it needs to equal 15.5 I did 6 x 15.5. That was 93. When you add all the others together you get 18. The difference is 75, so yeah.
6 x 15.5 = 93
1 + 4 + 8 + 3 + 2 = 18
93 - 18 = 75
75 + 18 = 93
93 ÷ 6 = 15.5
93 = The answer
Also I love how I'm only just 12 and am supposed to be in Elementary School or 'Primary School' as we call it in Britain (even though I'm not, I'm in Secondary) and I'm telling you teenagers how to do math. :3