Set S consists of positive numbers. If -1 is added as an element to set S, which of the following is impossible ?
The mean will decrease but median will not change.
The median will decrease but mean will not change.
The range will increase but median will not change.
The range will increase but mean will decrease.
The standard deviation will increase but mean will decrease.
what is the best way to test this.. Am getting bogged down by picking numbers .. Also on picking numbers am unable to decide between A B and C - all seem impossible. Pl help