Apps. and Interpretation for IBDP Maths Ebook 1 | Page 389

Answers
90.2 (a) Refer to solution
(b) (70, 70)
(c) Refer to solution
(d) Refer to solution
90.3 (a) Refer to solution
(b) Refer to solution
(c) p � 65, q � 95
90.4 (a) Refer to solution
(b) 15
(c) p � 20 , q � 40
Exercise 91
91.1 (a) (i) a � 0.2 , b � 52.4
(ii) 69.4
(b) (i) 0.183
(ii) Weak, Positive
91.2 (a) (i) a �� 2.09 , b � 96.1
(ii) 77.3 C
(b) (i) � 0.607
(ii) Moderate, Negative
91.3 (a) (i) a � 0.712 , b � 7.22
(ii) 25.0
(b) � 0.989
(c) 0.54
91.4 (a) (i) � 0.957
(ii) a �� 0.746 , b � 6.75
(b) 0.178
(c) 1.431 hours
Exercise 92
92.1 (a) (i) a � 0.157 , b �� 5.75
(ii) a represents the
average increase of
university entrance
mark when the public
exam score is
increased by 1
(b) 22.4
92.2 (a) (i) a � 3.42 , b � 1.55
(ii) b represents the
expected sales in
2011
(b) 10.1 million dollars
92.3 (a) (i) a � 5.98 , b � 21.6
(ii) a represents the
average increase of
number of visitors
when the maximum
temperature is
increased by 1 degree
Celsius
b represents the
expected number of
visitors when the
maximum
temperature is
zero degree Celsius
(b) 45.5
92.4 (a) (i) a � 6.85 , b � 24.3
(ii) a represents the
average increase of
the hardness of a
metal ingot when its
breaking strength is
increased by 1 tonne
per cm
b represents the
hardness of a metal
ingot when its
breaking strength is
zero tonne per cm
(b) 65.4
Exercise 93
93.1 (a) (i) 5.5
(ii) 4.5
(b) rs
� 0.0588
(c) There is a weak agreement
between Ravi and Yannick
www.seprodstore.com
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