6: ... and graphically from the graph in Figure 4.
Together with Addison Wesley Longman, we are in the process of eliminating typos and errors from subsequent printings of the Real World series. In the meantime, we hope that this listing of corrections to the first printing will be helpful to instructors and students using the text. (Changes are marked in color.)
p. 26, Line 6: ... and graphically from the graph in Figure 4.
p. 128, In the bottom half of the page, the second and third matrices of the four that appear should both be
3-18
-1326
p. 209, Example 5.
In the matrix S, change the entry S33 to
2.
p. 270, Exercise 3
The second constraint should be 2x + y 
6
p. 329, Exercise 59, missing text. The exercise should read:
59. Investment JoAnn Smith is considering investing up to $10,000 in three ways: a stock fund run by Integrity Investments, a bond fund sold by Citizen's Bank, and a guaranteed annuity run by Publisher's Insurance. Since the last is less risky than the others, she would like to invest no more than one quarter of the total in the first two funds. On the other hand, the stock fund has the highest historical rate of return, so she would like to invest as much as possible in that. How should she invest her money?
p. 349, Example 5, "In a survey of 400 high school seniors, 120 had not read. . .
p. 362, Exercises 19 & 20
19. (c) How many telephone numbers are possible if no adjacent repeated digits are allowed?
20. (c) How many Social Security Numbers are possible if no adjacent repeated digits are allowed?
p. 363, Exercise 32
32. If 8 male/female couples meet at a reunion and each person dances exactly once with each person of the opposite gender, what is the total number of couples that dance?
(a) 8 . 7 . 6 . 5 . 4 . 3 . 2. 1
(b) 16
(c) 44
(d) 4 . 3 . 2 . 1
(e) 82
p. 380, Exercise 29. How many groups of five marbles include either the lavender one or exactly one yellow one, but not both?
p. 454, Exercise 18. She gets at least one green one, given that she gets no red, fluorescent pink, or yellow ones.
p. 454, Instructions for Exercises 25-30 should read ". . .were due to begin paying federal student loans in 1992, and the subsequent number who defaulted.
p. 464, Exercise 4. P(X|Y) = 0.6, P(Y') = 0.4 . . .
p. 539 middle of the page.
Y1 = 1/((2
)^(0.5))e^(-X^2/2)
p. 542, Figure 13,
The caption should read: 3 
Z 3
p. 604, third line of table of values should read:
x 8 4 2 1 ...p. 605, Figure 2. Minus sign missing from the 2 below the x-axis.
p. 614, Exercise 38, line 3 ... IBM stocks depreciated at a rate of 16.28% per year.
p. 620 and 621 Example 5. Change "quarterly" to "monthly" in line 4 of p. 620 and line 3 of p. 621.
p. 664, table at top of page. The top-left entry should be "h" and not "h1."
p. 715, Example 98. Change all the x's to t's in the displayed formula.
p. 844, diagram in Exercise 41. The "50" next to the y-axis should read "30."
p. 937, Example 10 Change the minus sign to a plus sign on lines 3, 6, 8, 10 and 11
p. 950, Exercise 50. The formula for v should be v = 3tet2.
p. 1001, line 7: ... This is the program SUMS (not TRAP) in the appendix.
p. 1006, middle of the page: We then run SUMS and SIMP, with N ...
p. 1023, lines 3 and 4: replace e3 by e1. Line 5: replace 1.95 by 1.39.
p. 1026, Example 2: line 4 (displayed formula) delete the term 1/a in front of the inverse sine function.
Two lines below the box: delete the term 1/2 in front of the sin-1 and change the 1/6 to 1/3 in the following line.
p. A-51, line -4.
(See Figure 3, which shows the vertex at (1, 4).)
p. A-91 Section 2.1 Answers.
23. 200 quarts of vanilla
and 100 quarts of mocha
35. 33 dirty socks. . . [not pairs of socks]
p. A-92 Chapter 2 Review Exercises.
29. (3/2w+1, 0, 1/2w, w), w arbitrary
59. . . . and 6 servings of sherry;
0 beers, 10 servings of wine, 0 servings of sherry.
p. A-101 Section 4.4 Answers.
9. c = 80; x = 20/3,
y = 20/3
p. A-101 Chapter 4 Review Exercises.
31. C = 22; x = 8, y = 2
p. A-102, Section 5.1, Answers
5. A = {1, 2, 3}
7. B = {2, 4, 6, 8}
35. A' 
C =. . .
p. A-102, Section 5.2 Answers.
21. The part of A outside of both B and C should contain a 4.
23. The intersection between A and C (but outside of B) should contain a 3, not 1.
p. A-103, Section 5.4 Answers
39. C(13,2)
C(4,2) C(4,2) 44 = 123,552
41. 13 C(4,2) C(12,3) 4 4 4 = 1,098,240
p. A-104, Chapter 5 Review Exercise Answers.
43. C(12,6)
C(4,2)C(2,1)C(1,1)C(3,1)C(2,1)
C(4,1)C(2,2)C(1,1)C(3,1)C(2,1)
C(4,1)C(2,1)C(1,1)C(3,2)C(2,1)
C(4,1)C(2,1)C(1,1)C(3,1)C(2,2)
= 756
51. The answer given is correct, but the following equivalent expression is more consistent with answers given to other problems:
p. A-106 Section 6.4 Answers.
29. 8!/88
p. A-106 Section 6.5 Answers.
23. 5%
p. A-111 Section 7.4 Answers. The answers to many of these problems will change depending on how you round in intermediate calculations and whether you use the tables in the book, a calculator or a computer. These answers should be viewed as accurate only up to 2 or 3 significant digits.
p. A-118, Answer to Section 10.2, #17(a) should be (2, 1), (0, 1/2), (2, 0)
p. A-123, Answer to Section 11.1, #61, ... since C'( 25) is positive.
p. A-124, Section 11.5, #45. Change 4% to 2%.
p. A125, Chapter 11 Review, #83 replace $924.18 by $286.96.
 | Stefan Waner (matszw@hofstra.edu) | | Steven R. Costenoble (matsrc@hofstra.edu) |