She wished to climb mountains when she watched villagers from her room, going up the hill and suddenly vanishing after a while. One day, she decided to check it out herself. She found nobody except a few mountaineers. Later she saved money and enrolled in a course at Uttarkashi’s Nehru Institute of Mountaineering. Then she began climb mountains every year.

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 |
Represent the marks of the students of both the sections on the same graph by two frequency polygons. From the two polygons compare the performance of the two sections.