Question

What number should be removed from the list {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13} so that the mean of the remaining numbers is 7.25?

Answer 1

4 should be removed

Explanation:

Just do a process of elimination and work through the numbers.
`(1+2+3+5+6+7+8+9+10+11+12+13)/(12) = 7.25`