1. Observe the information's in the following cumilative frequency table

no. of days absent

less than 5

less than 10

less than 15

less than 20

less than 25

less than 30

less than 35

less than 40

less than 45

No. of students

29

224

465

582

634

644

650

653

655

Q.. Draw a 'less than' ogive and 'more than' ogive to represent the above data .

Q... Find median for the above data by interpreting the graph.

Q...why regularity is essential in students life (VBQ)

Class intervals  Frequency  Cumulative frequency less than cumulative frequency more than
0-5 29 less than 5  = 29 more than 0 = 655
5-10 195 less than 10 = 224 more than 5 = 626
10-15 241 less than 15 = 465 more than 10 = 431
15-20 117 less than 20 = 582 more than 15 = 190
20-25 52 less than 25 = 634 more than 20 = 73
25-30 10 less than 30 = 644 more than 25 = 21
30-35 6 less than 35 = 650 more than 30 = 11
35-40 3 less than 40 = 653 more than 35 = 5
40-45 2 less than 45 = 655 more than 40 = 2


For less than Ogive, we plot the following points :
(5,29); (10, 224); (15, 465); (20, 582); (25, 634); (30, 644), (35, 650); (40, 653) and (45, 655).
For more than Ogive, we plot the following points :
(0,655);(5,626); (10,431); (15,190); (20,73); (25,21); (30, 11); (35,5) and (40, 2).








From the intersection of two Ogives, we draw a perpendicular on x - axis, that meets x-axis at 12.15.

So, median  12.15

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