
Now let us consider a polygon where there is no class preceeding the first class. Let us take an example which gives us the marks scored by 50 students of a class, in an exam out of 100. The following table gives us the information about the data. Here the first class interval is 0  10. So the class preceeding it would lie on the negative X axis. The midpoint of the first class interval i.e. B is joined to this point with 0 frequency on the negative axis. Directions: On the basis of the given information answer the following questions 