three positive whole numbers have a median of 7 and a mean of 5 find the range of these 3 numbers
The median is the middle number so ...
Let the numbers be A, 7, B
(A+B+7)/3 = 5
now remember that A and B are whole positive numbers and $$A\le7\le B$$
So the only possible numbers are 1,7,7
The range is 7-1=6