Analysis and Approaches for IBDP Maths Ebook 1 | Page 325

Exercise 72
72.1 (a) (i) 1.30 and 5.17
(ii) 5.37
(b) 3.20
(c) 8
72.2 (a) 1.91
(b) 1.80 �x
� 4
(c) 1.2
72.3 (a) 4.54
(b) 2
72.4 (a) 7.34
(b) 17
Chapter 17
Exercise 73
73.1 (a) 10
(b) (i) 30
(ii) 72
73.2 (a) 108
(b) (i) 19
(ii) 1.5
73.3 (a) 21
(b) (i) 40
(ii) 44
73.4 (a) 10
(b) (i) 19
(ii) 34
Exercise 74
74.1 (a) a � 3, b � 14
(b) 24
74.2 (a) a � 63 , b � 73
(b) 89
74.3 (a) (i) 34
(ii) 24
(iii) 12
(b) 5
74.4 (a) (i) 5
(ii) 8
(iii) 6
(b) 9
Exercise 75
75.1 (a) (i) $7.5
(ii) 20
(b) (i) 75
(ii) 125
(c) 70
(d) 50
(e) Simple random sampling
75.2 (a) (i) 1.5 cm
(ii) 20
(iii) 40%
(iv) 1
(b) $90
(c) 80
75.3 (a) 25 minutes
(b) 15 minutes
(c) 60
(d) 40
(e) 52.5
(f) Systematic sampling
75.4 (a) 35 minutes
(b) 10 minutes
(c) 30
(d) 25
(e) 55
(f)
1
16
Exercise 76
76.1 (a) (i) 21
(ii) 18
(b) 2.54
(c) 1.15
76.2 (a) (i) 90
(ii) 50
(b) 24.5
(c) 2.60
76.3 (a) 12
(b) 50
(c) Discrete
76.4 (a) 6
(b) 24.5
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