The number of times a data, in the set, occurs is called :

1. upper-limit

2. class-mark

3. frequency

4. class-limit

The difference between the greatest and the smallest values of observations is called :

1. frequency

2. range

3. class-mark

4. class-limit

In a bar-graph, if the widths of all the bars are kept same, their heights are proportional to their :

1. class-size

2. class-mark

3. class-limits

4. frequency

In a pie-chart, the angle corresponding to different components is :

1. $\dfrac{\text{value of the component}}{\text{total value of all the components}} \times 360°$

2. $\dfrac{\text{total value of all the components}}{\text{value of the component}} \times 360°$

3. total value of all the components x value of the component x 360°

4. $\dfrac{360°}{\text{total value of all the components} \times \text{value of the component}}$