CONCEPTS OF DATABASE MANAGEMENT
9th Edition
ISBN: 9780357261354
Author: Pratt
Publisher: CENGAGE C
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Chapter 2, Problem 11RQ
To determine
To explain how a computed field is created in an Access Query.
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cases:
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 2 Solutions
CONCEPTS OF DATABASE MANAGEMENT
Ch. 2 - Prob. 1RQCh. 2 - Prob. 2RQCh. 2 - Prob. 3RQCh. 2 - Prob. 4RQCh. 2 - Prob. 5RQCh. 2 - Prob. 6RQCh. 2 - Prob. 7RQCh. 2 - Prob. 8RQCh. 2 - Prob. 9RQCh. 2 - Prob. 10RQ
Ch. 2 - Prob. 11RQCh. 2 - Prob. 12RQCh. 2 - Prob. 13RQCh. 2 - Prob. 14RQCh. 2 - Prob. 15RQCh. 2 - Prob. 16RQCh. 2 - Prob. 17RQCh. 2 - Prob. 18RQCh. 2 - Prob. 19RQCh. 2 - Prob. 20RQCh. 2 - Prob. 21RQCh. 2 - Prob. 22RQCh. 2 - Prob. 23RQCh. 2 - Prob. 24RQCh. 2 - Prob. 25RQCh. 2 - Prob. 26RQCh. 2 - Prob. 27RQCh. 2 - Prob. 28RQCh. 2 - Prob. 29RQCh. 2 - Prob. 30RQCh. 2 - Prob. 1BCEQBECh. 2 - Prob. 2BCEQBECh. 2 - Prob. 3BCEQBECh. 2 - Prob. 4BCEQBECh. 2 - Prob. 5BCEQBECh. 2 - Prob. 6BCEQBECh. 2 - Prob. 7BCEQBECh. 2 - Prob. 8BCEQBECh. 2 - Prob. 9BCEQBECh. 2 - Prob. 10BCEQBECh. 2 - Prob. 11BCEQBECh. 2 - Prob. 12BCEQBECh. 2 - Prob. 13BCEQBECh. 2 - Prob. 14BCEQBECh. 2 - Prob. 15BCEQBECh. 2 - Prob. 16BCEQBECh. 2 - Prob. 17BCEQBECh. 2 - Prob. 18BCEQBECh. 2 - Prob. 1BCERACh. 2 - Prob. 2BCERACh. 2 - Prob. 3BCERACh. 2 - Prob. 4BCERACh. 2 - Prob. 5BCERACh. 2 - Prob. 6BCERACh. 2 - Prob. 7BCERACh. 2 - Prob. 1CATCCh. 2 - Prob. 2CATCCh. 2 - Prob. 3CATCCh. 2 - Prob. 4CATCCh. 2 - Prob. 5CATCCh. 2 - Prob. 6CATCCh. 2 - Prob. 7CATCCh. 2 - Prob. 8CATCCh. 2 - Prob. 9CATCCh. 2 - Prob. 10CATCCh. 2 - Prob. 11CATCCh. 2 - Prob. 12CATCCh. 2 - Prob. 13CATCCh. 2 - Prob. 14CATCCh. 2 - Prob. 15CATCCh. 2 - Prob. 16CATCCh. 2 - Prob. 17CATCCh. 2 - Prob. 18CATCCh. 2 - Prob. 1SPTCCh. 2 - Prob. 2SPTCCh. 2 - Prob. 3SPTCCh. 2 - Prob. 4SPTCCh. 2 - Prob. 5SPTCCh. 2 - Prob. 6SPTCCh. 2 - Prob. 7SPTCCh. 2 - Prob. 8SPTCCh. 2 - Prob. 9SPTCCh. 2 - Prob. 10SPTCCh. 2 - Prob. 11SPTCCh. 2 - Prob. 12SPTCCh. 2 - Prob. 13SPTCCh. 2 - Prob. 14SPTCCh. 2 - Prob. 15SPTCCh. 2 - Prob. 16SPTCCh. 2 - Prob. 17SPTCCh. 2 - Prob. 18SPTCCh. 2 - Prob. 19SPTC
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