The marks obtained by 17 students in a mathematics test (out of 100) are given below :

91, 82, 100, 100, 96, 65, 82, 76, 79, 90, 46, 64, 72, 66, 68, 48, 49

The range of data is

1. 46

2. 54

3. 90

4. 100

The class mark of the class 90 - 120 is

1. 90

2. 105

3. 115

4. 120

The width of each of 5 continuous classes in a frequency distribution is 5 and the lower limit of the lowest class is 10. The upper limit of the highest class is

1. 15

2. 25

3. 35

4. 40

The class marks of a frequency distribution are given as follows :

15, 20, 25, ………

The class corresponding to the class mark 20 is

1. 12.5 - 17.5

2. 17.5 - 22.5

3. 18.5 - 21.5

4. 19.5 - 20.5