The numbers 10, 12, 14, 16, 17 and x are in ascending order. If the mean and median of these observations are same, the value of x is :

1. 16

2. 14

3. 54

4. 21

The median of first six prime numbers is :

1. 5

2. 7

3. 6

4. 7.5

The inter quartile range for the given ogive is :

1. 42

2. 32

3. 44

4. 54