Page 13 - TOP CLASS MATHS T5 KSSM

Mathematics Form 5 Chapter 7 Measures of Dispersion for Grouped Data
7. Construct a frequency polygon based on each of the following frequency tables. PL 3
Bina poligon kekerapan berdasarkan setiap jadual kekerapan yang berikut.
Example

Speed (km/h) / Laju (km/j) 31 – 40 41 – 50 51 – 60 61 – 70 71 – 80
Frequency/ Kekerapan 10 18 25 11 5
Use a scale of 2 cm to 10 km/h on the horizontal axis and 2 cm to 5 on the vertical axis.
Gunakan skala 2 cm kepada 10 km/j pada paksi mengufuk dan 2 cm kepada 5 pada paksi mencancang.
Speed (km/h) Frequency Midpoint Frequency
Laju (km/j) Kekerapan Titik tengah Kekerapan
21 – 30 0 25.5
25
31 – 40 10 35.5
20
41 – 50 18 45.5
15
51 – 60 25 55.5
61 – 70 11 65.5 10
71 – 80 5 75.5 5

81 – 90 0 85.5
0
25.5 35.5 45.5 55.5 65.5 75.5 85.5
Speed (km/h)
Laju (km/j)
Prepare a table for reference before constructing a frequency
polygon.
Sediakan satu jadual untuk rujukan sebelum membina poligon
kekerapan.

(a) Time (minutes) / Masa (minit) 5.1 – 6.0 6.1 – 7.0 7.1 – 8.0 8.1 – 9.0 9.1 – 10.0
Frequency/ Kekerapan 3 5 10 14 7
Use a scale of 2 cm to 1 minute on the horizontal axis and 2 cm to 4 on the vertical axis.
Gunakan skala 2 cm kepada 1 minit pada paksi mengufuk dan 2 cm kepada 4 pada paksi mencancang.

Time (minutes) Frequency Midpoint
Masa (minit) Kekerapan Titik tengah Frequency
Kekerapan
4.1 – 5.0 0 4.55
5.1 – 6.0 3 5.55 16
6.1 – 7.0 5 6.55
12
7.1 – 8.0 10 7.55
8.1 – 9.0 14 8.55 8
9.1 – 10.0 7 9.55
4
10.1 – 11.0 0 10.55
0
4.55 5.55 6.55 7.55 8.55 9.55 10.55
Time (minutes)
Masa (minit)

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