Introductory Combinatorics
5th Edition
ISBN: 9780134689616
Author: Brualdi, Richard A.
Publisher: Pearson,
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Chapter 8, Problem 10E
To determine
To prove: The constants
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EXAMPLE 6.2
In Example 5.4, we considered the random variables Y₁ (the proportional amount
of gasoline stocked at the beginning of a week) and Y2 (the proportional amount of
gasoline sold during the week). The joint density function of Y₁ and Y2 is given by
3y1, 0 ≤ y2 yı≤ 1,
f(y1, y2) =
0,
elsewhere.
Find the probability density function for U = Y₁ - Y₂, the proportional amount of
gasoline remaining at the end of the week. Use the density function of U to find E(U).
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.
Chapter 8 Solutions
Introductory Combinatorics
Ch. 8 - Let 2n(equally spaced) points on a circle be...Ch. 8 - Prove that the number of 2-by-n arrays
that can...Ch. 8 - Write out all of the multiplication schemes for...Ch. 8 - 5. * Let m and n be nonnegative integers with n ≥...Ch. 8 - 6. Let the sequence h0, h1, … , hn, … be defined...Ch. 8 - 7. The general term hn of a sequence is a...Ch. 8 - 8. Find the sum of the fifth powers of the first n...Ch. 8 - 9. Prove that the following formula holds for the...Ch. 8 - 10. If hn is a polynomial in n of degree m, prove...Ch. 8 - 11. Compute the Stirling numbers of the second...
Ch. 8 - 12. Prove that the Stirling numbers of the second...Ch. 8 - 13. Let X be a p-element set and let Y be a...Ch. 8 - Prob. 14ECh. 8 - 15. The number of partitions of a set of n...Ch. 8 - 11. Compute the Stirling numbers of the second...Ch. 8 - 17. Compute the triangle of Stirling numbers of...Ch. 8 - Write [n]k as a polynomial in n for k = 5, 6, and...Ch. 8 - Prove that the Stirling numbers of the first kind...Ch. 8 - Verify that [n]n = n!, and write n! as a...Ch. 8 - For each integer n = 1, 2, 3, 4, 5, construct the...Ch. 8 - Prob. 22ECh. 8 - Prob. 23ECh. 8 - Prob. 24ECh. 8 - Prob. 25ECh. 8 - Determine the conjugate of each of the following...Ch. 8 - For each integer n > 2, determine a self-conjugate...Ch. 8 - Prove that conjugation reverses the order of...Ch. 8 - Prove that the number of partitions of the...Ch. 8 - Prove that the partition function satisfies
Ch. 8 - Prob. 32ECh. 8 - Prob. 33ECh. 8 - Prob. 34ECh. 8 - Prob. 35ECh. 8 - 36. Prove that the Catalan number Cn equals the...
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