Which of the following variables are discrete?

1. daily temperature of your city

2. sizes of shoes

3. distance travelled by a man

4. time

The marks obtained by 15 students in a test (out of hundred) are given below :

81, 72, 90, 90, 80, 55, 72, 66, 69, 80, 36, 54, 62, 56 and 58

The range of data is :

1. 46

2. 54

3. 90

4. 100

In the class-intervals 1-10, 11-20, 21-30; the class 11-20 after adjustment is :

1. 0.5-10.5

2. 20.5-30.5

3. 10.5-30.5

4. 10.5-20.5

The class marks of a frequency distribution are 10, 15, 20, 25, …………… The class corresponding to the class mark 15 is :

1. 12.5-17.5

2. 10-20

3. 10.25-17

4. 14-16