The following table gives the distribution of students of two sections according to the marks obtained by them:
| Section A | Section B | ||
| Marks | Frequency | Marks | Frequency |
| \(0-10\) | \(3\) | \(0-10\) | \(5\) |
| \(10-20\) | \(9\) | \(10-20\) | \(19\) |
| \(20-30\) | \(17\) | \(20-30\) | \(15\) |
| \(30-40\) | \(12\) | \(30-40\) | \(10\) |
| \(40-50\) | \(9\) | \(40-50\) | \(1\) |
Plot the marks of the students of both the sections on the same graph by two frequency polygons.
Find the class marks of the given class intervals by using the following formula.
| Section A | Section B | ||||
| Marks | Class Mark | Frequency | Marks | Class Mark | Frequency |
| \(0-10\) | \(3\) | \(0-10\) | \(5\) | ||
| \(10-20\) | \(9\) | \(10-20\) | \(19\) | ||
| \(20-30\) | \(17\) | \(20-30\) | \(15\) | ||
| \(30-40\) | \(12\) | \(30-40\) | \(10\) | ||
| \(40-50\) | \(9\) | \(40-50\) | \(1\) | ||
From the two polygons compare the performance of the two sections in the following: