Page 4 - Lesson Note MCT 2 52
P. 4
Answer: -
X F C.F
0 - 10 3 3
10 – 20 4 7
20 – 30 2 9
30 – 40 7 16
40 - 50 9 25
= ∑ = 25
Median = ℎ .
2
25
= ℎ
2
= 12.5th item.
12.5th item lies in the group 30 – 40
= 30, c.f. = 9, f = 7, i = 10
1
− .
Median = + 2 ×
1
12.5−9
= 30 + × 10
7
3.5
= 30 + × 10
7
= 30 + 5 = 35
