Observe the given table and answer the following questions:

How many students obtained marks less than 40?

Observe the given table and answer the following questions: How many students obtained marks less than 30?

Observe the given table and answer the following questions: How many students obtained marks less than 20?

Observe the given table and answer the following questions: How many students obtained marks more than 20?

Observe the given table and answer the following questions: How many students obtained marks more than 10?

Using the data, preapre less than type cummulative frequency table and asnwer the following question: How many students obtained less than 40 marks?

Using the data, preapre less than type cummulative frequency table and asnwer the following question: How many students obtained less than 10 marks?

Using the data, preapre less than type cummulative frequency table and asnwer the following question: How many students obtained less than 60 marks?