Answer the following questions using the applet.[br](a) If the passing mark is 50, how many students fail in the test?[br](b) If 50% of students pass the test what is the passing mark?[br] What is the passing mark if 70% of students pass the test?[br](c) A prize will be given to the students who get 75 marks or above. How many students get the prize?[br]

Enter another set of data (of maximum 10 classes) in the worksheet to construct and explore its cumulative frequency polygon.