Answers to all pages - Hodder Plus Home
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Model answers<br />
(d) (i)<br />
143<br />
4·3 minutes (4·2 <strong>to</strong> 4·5 is acceptable) (ii) 200 – 57 = 143, –––– = 0·715 (0·69 <strong>to</strong> 0·75 is acceptable)<br />
200<br />
4<br />
Age (x) in years 0 x 5 5 x 15 15 x 25 25 x 45 45 x 75<br />
Number of patients 14 41 59 70 16<br />
Frequency density 2·8 4·1 5·9 3·5 0·53<br />
6<br />
5<br />
Frequency density<br />
4<br />
3<br />
2<br />
1<br />
0<br />
10 20 30 40<br />
50<br />
60 70 80<br />
Age (years)<br />
5<br />
Time in minutes (t) 0 t 1 1 t 3 3 t 5 5 t 10 10 t 20<br />
Number of c<strong>all</strong>s 12 32 19 20 15<br />
Frequency density 12 16 9·5 4 1·5<br />
20<br />
Frequency per one minute interval<br />
15<br />
10<br />
5<br />
0<br />
0<br />
5 10 15 20<br />
Time (t minutes)<br />
6 Since area = frequency, missing frequencies are 20 × 1·4 = 28, 15 × 8·8 = 132, 15 × 7·2 = 108 and 30 × 2 = 60.<br />
Time (t minutes) 0–20 20–30 30–45 45–60 60–90<br />
Frequency 28 60 132 108 60<br />
IGCSE Revision Guide for Mathematics Model <strong>Answers</strong> © 2004, <strong>Hodder</strong> & S<strong>to</strong>ugh<strong>to</strong>n Educational<br />
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