Concepts of Database Management
9th Edition
ISBN: 9781337093422
Author: Joy L. Starks, Philip J. Pratt, Mary Z. Last
Publisher: Cengage Learning
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Chapter 8, Problem 3BCE
To determine
To identify the fields that cause the table no longer to be in third normal form and the normal form of denormalized table.
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Compare the Poisson approximation with the correct binomial probability for the following
a. P{X=2} when n = 8, p = 0.2
b. P{X 5} when n
=
10, p = 0.5
c. P{X=0} when n = 20, p = 0.2
d. P{X=3} when n = 9, p = 0.1
4.
Suppose that the average number of cars abandoned weekly on a certain highway is λ = 1.68.
Approximate the probability that there will be
(a) No abandoned cars in the next week.
(b) At least 2 abandoned cars in the next week.
Hint: Model the problem with a Poisson random variable.
od
The probability mass function of a discrete random variable X is given by
P(X = 1) = {}
x=1,2,3,4
10 otherwise
(a) Draw the probability mass function (PMF) of this random variable.
(b) Draw the cumulative distribution function (CDF) of this random variable.
(c) What is P{2< x <4}? Write it in terms of the CDF.
(d) What is E[X]?
(e) What is Var[X]?
(f) What is E[X (6-X)]?
(g) What is Var[3X - 2]?
Chapter 8 Solutions
Concepts of Database Management
Ch. 8 - Prob. 1RQCh. 8 - Prob. 2RQCh. 8 - Prob. 3RQCh. 8 - Prob. 4RQCh. 8 - Prob. 5RQCh. 8 - Prob. 6RQCh. 8 - Prob. 7RQCh. 8 - Prob. 8RQCh. 8 - Prob. 9RQCh. 8 - Prob. 10RQ
Ch. 8 - Prob. 11RQCh. 8 - Prob. 12RQCh. 8 - Prob. 13RQCh. 8 - Prob. 14RQCh. 8 - Prob. 15RQCh. 8 - Prob. 16RQCh. 8 - Prob. 17RQCh. 8 - Prob. 18RQCh. 8 - Prob. 19RQCh. 8 - Prob. 20RQCh. 8 - Prob. 21RQCh. 8 - Prob. 1BCECh. 8 - Prob. 2BCECh. 8 - Prob. 3BCECh. 8 - Prob. 4BCECh. 8 - Prob. 5BCECh. 8 - Prob. 1CATCCh. 8 - Prob. 2CATCCh. 8 - Prob. 3CATCCh. 8 - Prob. 4CATCCh. 8 - Prob. 1SPTCCh. 8 - Prob. 2SPTCCh. 8 - Prob. 3SPTCCh. 8 - Prob. 4SPTCCh. 8 - Prob. 5SPTC
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