For the given frequency distribution, the class mark is :

1. $\dfrac{38 - 34}{2}$

2. $\dfrac{30 + 34}{2}$

3. 10 - 8

4. 34 + 38

The cumulative curve for a frequency distribution starts from :

1. 0

2. $\dfrac{\text{upper limit + lower limit}}{2}$

3. lower limit of 1st class

4. $\dfrac{\text{lower limit - upper limit}}{2}$

Draw histograms for the following frequency distributions :

Draw histograms for the following frequency distributions :