Answer the following questions using the applet.
(a) If the passing mark is 50, how many students fail in the test?
(b) If 50% of students pass the test what is the passing mark?
What is the passing mark if 70% of students pass the test?
(c) A prize will be given to the students who get 75 marks or above. How many students get the prize?
(d) If 8 prizes are to be given, what is the mark above or equal to which a prize would be given?
(e) How many students have marks between 55 and 75?

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