The median of a frequency distribution is found graphically with the help of

1. Ogive

2. Histogram

3. Frequency polygon

4. Bar graph

The median of 0, 2, 2, 2, -3, 5, -1, 5, 5, -3, 6, 6, 5, 6 is :

1. -1.5

2. 0

3. 2

4. 3.5

Consider the following table :

The median of the above frequency distribution is :

1. 122 mm

2. 122.5 mm

3. 122.75 mm

4. 123 mm

Consider the following table:

The upper limit of the median class is :

1. 10

2. 15

3. 20

4. 25