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

Average value of the median of 2, 8, 3, 7, 4, 6, 1 and the mode of 2, 9, 3, 4, 9, 6, 9 is:

1. 6

2. 6.5

3. 8

4. 9

The mode of a frequency distribution can be determined graphically from :

1. Histogram

2. Frequency polygon

3. Ogive

4. Bar graph