Calculus for Business, Economics, Life Sciences, and Social Sciences (13th Edition)
13th Edition
ISBN: 9780321869838
Author: Raymond A. Barnett, Michael R. Ziegler, Karl E. Byleen
Publisher: PEARSON
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Textbook Question
Chapter B.3, Problem 37E
Explain why the alternating sum of the entries in each row of Pascal’s triangle (e.g., 1 – 4 + 6 – 4+ 1) is equal to 0.
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7.20
a
If U has a x² distribution with v df, find E(U) and V (U).
b Using the results of Theorem 7.3, find E(S2) and V (S2) when Y₁, Y2,..., Y, is a random
sample from a normal distribution with mean μ and variance o².
According to a survey conducted by the American Bar Association, 1 in every 410 Americans
is a lawyer, but 1 in every 64 residents of Washington, D.C., is a lawyer.
a If you select a random sample of 1500 Americans, what is the approximate probability that
the sample contains at least one lawyer?
b If the sample is selected from among the residents of Washington, D.C., what is the ap-
proximate probability that the sample contains more than 30 lawyers?
c If you stand on a Washington, D.C., street corner and interview the first 1000 persons who
walked by and 30 say that they are lawyers, does this suggest that the density of lawyers
passing the corner exceeds the density within the city? Explain.
7.50 Shear strength measurements for spot welds have been found to have standard deviation 10
pounds per square inch (psi). If 100 test welds are to be measured, what is the approximate
probability that the sample mean will be within 1 psi of the true population mean?
7.51
Refer to Exercise 7.50. If the standard deviation of shear strength measurements for spot welds
is 10 psi, how many test welds should be sampled if we want the sample mean to be within
1 psi of the true mean with probability approximately 992
Chapter B.3 Solutions
Calculus for Business, Economics, Life Sciences, and Social Sciences (13th Edition)
Ch. B.3 - Evaluate. (A)4! (B)7!6! (C)8!5!Ch. B.3 - Find (A)5C2 (B)6C0Ch. B.3 - Use the binomial theorem to expand (x + 2)5.Ch. B.3 - Use the binomial theorem to find the fourth term...Ch. B.3 - In Problems 120, evaluate each expression. 1.6!Ch. B.3 - In Problems 120, evaluate each expression. 2.7!Ch. B.3 - In Problems 120, evaluate each expression. 3.10!9!Ch. B.3 - In Problems 120, evaluate each expression....Ch. B.3 - In Problems 120, evaluate each expression. 5.12!9!Ch. B.3 - In Problems 120, evaluate each expression. 6.10!6!
Ch. B.3 - Prob. 7ECh. B.3 - In Problems 120, evaluate each expression....Ch. B.3 - Prob. 9ECh. B.3 - In Problems 120, evaluate each expression....Ch. B.3 - In Problems 120, evaluate each expression....Ch. B.3 - Prob. 12ECh. B.3 - Prob. 13ECh. B.3 - In Problems 120, evaluate each expression. 14.7C3Ch. B.3 - In Problems 120, evaluate each expression. 15.6C5Ch. B.3 - Prob. 16ECh. B.3 - In Problems 120, evaluate each expression. 17.5C0Ch. B.3 - In Problems 120, evaluate each expression. 18.5C5Ch. B.3 - In Problems 120, evaluate each expression....Ch. B.3 - Prob. 20ECh. B.3 - Expand each expression in Problems 2126 using the...Ch. B.3 - Expand each expression in Problems 2126 using the...Ch. B.3 - Expand each expression in Problems 2126 using the...Ch. B.3 - Expand each expression in Problems 2126 using the...Ch. B.3 - Expand each expression in Problems 2126 using the...Ch. B.3 - Expand each expression in Problems 2126 using the...Ch. B.3 - Find the indicated term in each expansion in...Ch. B.3 - Prob. 28ECh. B.3 - Find the indicated term in each expansion in...Ch. B.3 - Find the indicated term in each expansion in...Ch. B.3 - Find the indicated term in each expansion in...Ch. B.3 - Prob. 32ECh. B.3 - Show that nC0 = nCn for n 0.Ch. B.3 - Prob. 34ECh. B.3 - The triangle shown here is called Pascals...Ch. B.3 - Explain why the sum of the entries in each row of...Ch. B.3 - Explain why the alternating sum of the entries in...Ch. B.3 - Prob. 38ECh. B.3 - Show that nCr1+nCr=n+1Cr for n r 1.
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