The Mathematics of Money

654 Appendix A Answers to Odd-Numbered Exercises

Chapter 15 Section 15.2

1. $3.14 per gallon


2. $497.50


3. a) $670.94, b) $110.33


4. a) $10,293.50; b) $2,459.51; c) $91.09, $91.09


5. $497.50


6. a) $670.94, b) $107.58


7. a) $10,293.50; b) $2,655.45; c) $91.09, $98.35


8. $497.50


9. a) $670.94, b) $117.48


10. a) $10,293.50; b) $1,984.50; c) $91.09, $73.50


11. $120,259


12. $17,049,693


13. $15,500; $5,500 loss


14. a) $1,355.14, b) $1,371.67, c) $1,329.17


15. a) $518, b) $478.33, c) $577.50

Chapter 16 Section 16.1

1. Atlanta

Portland

Chicago

Phoenix

San Jose

3.

Speedywheels

B

D

E

0 200 400 600 800 1000

C

A

Rating

Competitor

5. a) pie, b) bar, c) pie, d) line, e) bar


6. The revised chart. It accentuates the difference
   between the counties’ tax rates; it makes it
   appear as though Chatakoin County’s tax rate is
   extremely low compared to the others.

Chapter 16 Section 16.2

1. a) 16.7 g, b) 16.4 g


2. a) $4,672, b) $4,128.50


3. $11.04


4. $216,295/employee


5. a) 13.86%, b) probably grew by a similar percent,
   but not necessarily the same, c) nothing; index
   tells you nothing about any individual stock


6. $261,345


7. $44,690
   15. a) 770 claims, b) $894.00
   17. a) 134 loaves, b) $0.31
   19. $7.33
   21. The company can advertise a price of “$599 after
   rebate” when, in fact, they expect to be getting
   $713 per TV.

Chapter 16 Section 16.3

1. a) 838

b)

Hours Deviation

Deviation

Squared

835 
 3 9

842  4 16

(^808)
30 900
798
40 1,600
907  69 4,761
To tal: 7,286
c) 42.7 hours

3. 15 minutes


4. Less consistent


5. Increasing; more variation in student ages


6. a) 1.56 ounces, b) between 126.75 and
   129.87 ounces, c) at least 88.9%


7. c) Would be approximately 99%


8. a) 87.7%, b)0.78%, c) The mean is higher, which
   is good, and the standard deviation is lower, which
   is also good. The results of these samples appear
   to exceed the company’s standards.


9. We are basing this on only a few lightbulbs; we
   might have been lucky and made a particularly
   good selection.

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