Consider the following table:

The upper limit of the median class is :

1. 10

2. 15

3. 20

4. 25

The marks secured (out of 10) by a student in 15 unit tests are as follows:

5, 4, 7, 5, 8, 8, 8, 5, 7, 9, 8, 7, 9, 10, 8

The mode of the above data is :

1. 5

2. 7

3. 8

4. 10

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

1. Histogram

2. Frequency polygon

3. Ogive

4. Bar graph

If the mode of the following data is 7, the value of k is :

2, 4, 6, 7, 5, 6, 10, 6, 7, 2k + 1, 9, 7, 13

1. 2

2. 3

3. 4

4. 7