Gr 10 Data Handling 3 - Maths Excellence

2. (a)
4
6 6 8
2 2 3 7 8 8 8
2 4 4 4 4 5 5 5 5 6 6 7 7 8 8 8 9 9
0 1 1 1 1 2 2 3 3 3 4 4 4 4 4 4 5 5 5 6 6 6 8 8 8 8 8 9 9 9 9
0 0 2 2 2 3 3 3 3 4 4 4 4 4 4 4 4 4 5 5 5 5 5 6 6 6 6 6 6 6 7 8 8 8 8 9 9
0 0 1 2 2 2 2 2 2 2 4 4 4 4 4 4 5 5 6 6 6 6 6 6 6 6 6 7 7 7 7 7 7 7 7 7 7 7 7 8 8 9 9 9 9 9 9 9
0 0 0 1 1 4 4 4 5 5 5 5 6
(b)
Class interval Frequency Midpoint class interval Frequency × Midpoint
10 – 19 kg – – –
20 – 29 kg 1 24,5 24,5
30 – 39 kg 3 34,5 103,5
40 – 49 kg 7 44,5 311,5
50 – 59 kg 18 54,5 981
60 – 69 kg 31 64,5 1999,5
70 – 79 kg 38 74,5 2831
80 – 89 kg 49 84,5 4140,5
90 – 99 kg 13 94,5 1228,5
100 – 109kg - - -
Totals 160 - 11620
11 620
(c) Estimated mean = _
160 = 72,6
Lesson 30
Activity 1
A 2 3 5 7 9 10 11 13 15 16 16 17 18 19 21 22 23 25 32
B 2 3 5 7 8 9 10 11 13 15 16 16 17 18 18,5 19 21 22 23
C 2 3 5 7 9 9,5 10 11 13 15 16 16 16 17 18 19 21 21,5 22 23 25 32 34
D 2 3 5 7 9 10 11 13 15 15,5 16 16 17 18 19 21 22 23 25
Activity 2
333
1. (a) Mean for 10A: _
19 = 17,5
367
Mean for 10B: _
20 = 18,4
260
Mean for 10C: _
18 = 14,4
(b) Mode for 10A: 16
Mode for 10B: 14
Mode for 10C: 14
(c) Median for 10A: 16
Median for 10B: 17,5
Median for 10C: 14
25
10 LC G10 MATHS LWB.indb 25 2008/09/09 12:22:52 PM