Apps. and Interpretation for IBDP Maths Ebook 1 | Page 383

Answers
Exercise 66
66.1 (a) (i) 27.5
(ii) 30 �x
� 35
(b) (i) 34.625
(ii) 6.06
(iii) 36.7
66.2 (a) f � 15
(b) (i) Continuous
(ii) 175 USD
(iii) 0 �x
� 50
(c) (i) 81.75 USD
(ii) 67.9 USD
66.3 (a) 12
(b) (i) 18
(ii) 12 �x
� 16
(c) (i) 11.1
(ii) 4.95
(d) 16
66.4 (a) p � 6, q � 5 , r � 3, s � 2
(b) 0�x
� 3
(c) (i) 2.87
(ii) 3.09
(iii) 7.49%
Exercise 67
67.1 (a) (i) 21
(ii) 18
(b) 2.54
(c) 1.15
67.2 (a) (i) 90
(ii) 50
(b) 24.5
(c) 2.60
67.3 (a) 12
(b) 50
(c) Discrete
67.4 (a) 6
(b) 24.5
Exercise 68
68.1 (a) a � 3, b � 14
(b) 24
68.2 (a) a � 63 , b � 73
(b) 89
68.3 (a) (i) 34
(ii) 24
(iii) 12
(b) 5
68.4 (a) (i) 5
(ii) 8
(iii) 6
(b) 9
Exercise 69
69.1 (a) 10
(b) (i) 30
(ii) 72
69.2 (a) 108
(b) (i) 19
(ii) 1.5
69.3 (a) 21
(b) (i) 40
(ii) 44
69.4 (a) 10
(b) (i) 19
(ii) 34
Exercise 70
70.1 (a) (i) $7.5
(ii) 20
(b) (i) 75
(ii) 125
(c) 70
(d) 50
(e) Simple random sampling
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