Page 2 - Lesson Note MCT 2 53

Less than 80 130

Answer: -

X F C.F
0 – 10 05 05
10 – 20 15 20

20 – 30 25 45
30 – 40 35 80
40 – 50 20 100
50 – 60 15 115
60 – 70 10 125

70 - 80 05 130
= ∑ = 130

Median = ℎ ℎ
2

130
= = 65th data in the series.
2
Median class is 30 – 40

= 30, f = 35,
1

c. f = 45, i = 10.

− .
Median = + 2 ×
1

65 − 45
= 30 + × 10
35

200
= 30 +
35
= 30 + 5.7143

= 35.7143

Ex: - Calculate median from the following data.

Marks more than 0 10 20 30 40 50 60 70
No of students 100 92 78 44 32 18 15 13