In a grouped frequency distribution, the class interval are 40 - 49, 50 - 59, …, 80 - 89. The upper boundary of the class (50 - 59) is :

1. 59

2. 59.5

3. 49.5

4. 60

If 0 - 9, 10 - 19, 20 - 29, …., are the classes of a grouped frequency distribution, then the width of each class is :

1. 9

2. 9.5

3. 10

4. 9 or 10

The width of each class interval of a grouped frequency distribution is 8. The lower boundary of the class whose mid-value is 10 is :

1. 2

2. 4.5

3. 5.5

4. 6

The width of each class of a frequency distribution is 5. The upper boundary of the class whose class mark is 25 is :

1. 22

2. 22.5

3. 27

4. 27.5