5th grade
posted by caitlin .
Math. How can I make up a data set of at least 12 numbers that have the following landmarks, maximum 18: mode: 7, range: 13, median: 12?

5th grade is NOT the School Subject. You must identify it correctly for the correct volunteer teacher to read your post. It is not I!
Sra 
Your Max (highest number) = 18
Your range is 13 so your minimum number in your set =5
You need the mean to = 12 so all twelve numbers in your set have to equal 144 so that the 12 individual numbers will have a mean of 12 (144/12=12).
The mode = 7  so 7 is going to occur more than once (the mode is the number occurring most often).
A SAMPLE answer is: 57771113131515161718 (totaled=144/12 = mean of 12); 7 occurs three times so is the mode. There are other combinations 
find the range of 78, 9, 100, 6 ?