The cumulative curve for a frequency distribution terminates at :

1. 100

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

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

4. upper limit of last class

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 frequency of the class 70-90 is :

1. 80

2. 120

3. 180

4. 40

Draw histograms for the following frequency distributions :