If the mean of observations x, x + 2, x + 4, x + 6 and x + 8 is 11, find the value of x.

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

Median of numbers 10, 12, 9, 8, 10, 12, 10, 6 and 4 is :

1. 12

2. 10

3. 6

4. 9

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