Page 17 - TOP CLASS MATHS T5 KSSM

Mathematics Form 5 Chapter 7 Measures of Dispersion for Grouped Data

(b) Score
Skor 81 – 85 86 – 90 91 – 95 96 – 100 101 – 105 106 – 110 111 – 115
Frequency 9 12 17 20 15 11 8
Kekerapan

Score Frequency Upper boundary Cumulative frequency
Skor Kekerapan Sempadan atas Kekerapan longgokan
76 – 80 0 80.5 0
81 – 85 9 85.5 9
86 – 90 12 90.5 21
91 – 95 17 95.5 38
96 – 100 20 100.5 58
101 – 105 15 105.5 73
106 – 110 11 110.5 84
111 – 115 8 115.5 92

Cumulative frequency
Kekerapan longgokan

100
(i) 1 × 92 = 23
90 4
From the ogive,
Daripada ogif,
80 Q 1 = 91.0
1
(ii) × 92 = 46
70 2
From the ogive,
Daripada ogif,
60
Q 2 = 97.5

50 (iii) 3 × 92 = 69
4
From the ogive,
40 Daripada ogif,
Q 3 = 104.0
30 60
(iv) × 92 = 55.2  55
100
From the ogive,
20
Daripada ogif,
P 60 = 99.5

10
0
80.5 85.5 90.5 95.5 100.5 105.5 110.5 115.5
Score
Skor

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