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

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

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

The lower limit of the modal class of the following data is:

1. 10

2. 20

3. 30

4. 40