12 observations in a data are written in ascending order. If the last (12^th) observation is doubled, the median will increase by :

1. 12

2. 24

3. 0

4. 6

12 observations in a data are written in descending order. If the first observation is doubled, the median will :

1. remain same

2. increase by 12

3. decrease by 12

4. change by 12

The median of 80 observations is 60. If each observation is doubled, the resulting median will be :

1. 60

2. 20

3. 140

4. 120

If each observation in a data is decreased by two, their :

1. mean decreases by 2, but median remains same.

2. mean remains same, but median decreases, by 2.

3. mean and median both decrease by 2.

4. mean and median both remain the same.