Fundamentals of Differential Equations and Boundary Value Problems
7th Edition
ISBN: 9780321977106
Author: Nagle, R. Kent
Publisher: Pearson Education, Limited
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Chapter 6.1, Problem 23E
Let
a.
b.
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In Gallup's Annual Consumption Habits Poll, telephone interviews were conducted for a
random sample of 1014 adults aged 18 and over. One of the questions was, "How many
cups of coffee, if any, do you drink on an average day?" The following table shows the
results obtained (Gallup website, August 6, 2012).
Number of Cups
per Day
0
1
2
3
4 or more
Number of
Responses
365
264
193
91
101
Define a random variable x = number of cups of coffee consumed on an average day. Let
x=4 represent four or more cups.
a. Develop a probability distribution for x.
b. Compute the expected value of x.
c. Compute the variance of x.
d. Suppose we are only interested in adults who drink at least one cup of coffee on an
average day. For this group, let y = the number of cups of coffee consumed on an
average day. Compute the expected value of y and compare it to the expected value of x.
Ten major college football bowl games were played in January 2010, with the University
of Alabama beating the University of Texas 37 to 21 to become the national champion
of college football. The results of the 10 bowl games follow (USA Today, January 8, 2010).
Bowl Game
Score
Outback
Gator
Auburn 38 Northwestern 35
Florida State 33 West Virginia 21
Capital One
Penn State 19 LSU 17
Rose
Ohio State 26 Oregon 17
Florida 51 Cincinnati 24
Sugar
Cotton
Alamo
Fiesta
Mississippi State 21 Oklahoma State 7
Texas Tech 41 Michigan State 31
Boise State 17 TCU 10
Orange
Iowa 24 Georgia Tech 14
Championship
Alabama 37 Texas 21
Predicted
Point Margin
Actual
Point Margin
5
3
1
12
3
-2
14
3
9
-4
-3
4
229740706
14
10
10
16
The predicted winning point margin was based on Las Vegas betting odds approximately
one week before the bowl games were played. For example, Auburn was predicted to beat
Northwestern in the Outback Bowl by five points. The actual winning point margin for Au-
burn was three points. A…
Chapter 6 Solutions
Fundamentals of Differential Equations and Boundary Value Problems
Ch. 6.1 - In Problems 1-6, determine the largest interval...Ch. 6.1 - In Problems 1-6, determine the largest interval...Ch. 6.1 - In Problems 1-6, determine the largest interval...Ch. 6.1 - In Problems 1-6, determine the largest interval...Ch. 6.1 - In Problems 1-6, determine the largest interval...Ch. 6.1 - In Problems 1-6, determine the largest interval...Ch. 6.1 - Prob. 7ECh. 6.1 - In Problems7-14, determine whether the given...Ch. 6.1 - In Problems7-14, determine whether the given...Ch. 6.1 - In Problems7-14, determine whether the given...
Ch. 6.1 - In Problems7-14, determine whether the given...Ch. 6.1 - In Problems7-14, determine whether the given...Ch. 6.1 - In Problems7-14, determine whether the given...Ch. 6.1 - In Problems7-14, determine whether the given...Ch. 6.1 - Using the Wronskian in Problems 15-18, verify that...Ch. 6.1 - Prob. 16ECh. 6.1 - Prob. 17ECh. 6.1 - Prob. 18ECh. 6.1 - In Problems 19-22, a particular solution and a...Ch. 6.1 - In Problems 19-22, a particular solution and a...Ch. 6.1 - In Problems 19-22, a particular solution and a...Ch. 6.1 - In Problems 19-22, a particular solution and a...Ch. 6.1 - Let L[y]:=y+y+xy, y1(x):=sinx, and y2(x):=x....Ch. 6.1 - Let L[y]:=yxy+4y3xy", y1(x)=cos2x, and y2(x):=1/3....Ch. 6.1 - Prob. 25ECh. 6.1 - Prob. 26ECh. 6.1 - Prob. 27ECh. 6.1 - Prob. 28ECh. 6.1 - Prob. 29ECh. 6.1 - Prob. 30ECh. 6.1 - Prob. 31ECh. 6.1 - Prob. 32ECh. 6.1 - Prob. 33ECh. 6.1 - Prob. 34ECh. 6.1 - Prob. 35ECh. 6.2 - In Problems 1-14, find a general solution for the...Ch. 6.2 - Prob. 2ECh. 6.2 - In Problems 1-14, find a general solution for the...Ch. 6.2 - Prob. 4ECh. 6.2 - Prob. 5ECh. 6.2 - Prob. 6ECh. 6.2 - Prob. 7ECh. 6.2 - Prob. 8ECh. 6.2 - Prob. 9ECh. 6.2 - Prob. 10ECh. 6.2 - Prob. 11ECh. 6.2 - Prob. 12ECh. 6.2 - Prob. 13ECh. 6.2 - In Problems 1-14, find a general solution for the...Ch. 6.2 - In Problems 15-18, find a general solution to the...Ch. 6.2 - Prob. 16ECh. 6.2 - In Problems 15 18, find a general solution to the...Ch. 6.2 - Prob. 18ECh. 6.2 - Prob. 19ECh. 6.2 - In Problems 1921, solve the given initial value...Ch. 6.2 - Prob. 21ECh. 6.2 - Prob. 22ECh. 6.2 - In Problems 22 and 23, find a general solution for...Ch. 6.2 - Prob. 24ECh. 6.2 - Prob. 25ECh. 6.2 - Prob. 26ECh. 6.2 - Prob. 27ECh. 6.2 - Find a general solution to y3yy=0 by using Newtons...Ch. 6.2 - Prob. 29ECh. 6.2 - Prob. 30ECh. 6.2 - Higher-Order Cauchy-Euler Equations. A...Ch. 6.2 - Prob. 32ECh. 6.2 - On a smooth horizontal surface, a mass of m1 kg is...Ch. 6.2 - Suppose the two springs in the coupled mass-spring...Ch. 6.2 - Vibrating Beam. In studying the transverse...Ch. 6.3 - In Problems 1-4, use the method of undetermined...Ch. 6.3 - Prob. 2ECh. 6.3 - Prob. 3ECh. 6.3 - Prob. 4ECh. 6.3 - In Problems 5-10, find a general solution to the...Ch. 6.3 - In Problems 5-10, find a general solution to the...Ch. 6.3 - Prob. 7ECh. 6.3 - Prob. 8ECh. 6.3 - Prob. 9ECh. 6.3 - In Problems 5-10, find a general solution to the...Ch. 6.3 - In Problems 11-20, find a differential operator...Ch. 6.3 - In Problems 11-20, find a differential operator...Ch. 6.3 - In Problems 11-20, find a differential operator...Ch. 6.3 - In Problems 11-20, find a differential operator...Ch. 6.3 - In Problems 11-20, find a differential operator...Ch. 6.3 - In Problems 11-20, find a differential operator...Ch. 6.3 - In Problems 11-20, find a differential operator...Ch. 6.3 - In Problems 11-20, find a differential operator...Ch. 6.3 - In Problems 11-20, find a differential operator...Ch. 6.3 - In Problems 11-20, find a differential operator...Ch. 6.3 - In Problems 21-30, use the annihilator method to...Ch. 6.3 - In Problems 21-30, use the annihilator method to...Ch. 6.3 - In Problems 21-30, use the annihilator method to...Ch. 6.3 - In Problems 21-30, use the annihilator method to...Ch. 6.3 - In Problems 21-30, use the annihilator method to...Ch. 6.3 - In Problems 21-30, use the annihilator method to...Ch. 6.3 - In Problems 21-30, use the annihilator method to...Ch. 6.3 - Prob. 28ECh. 6.3 - Prob. 29ECh. 6.3 - In Problems 21-30, use the annihilator method to...Ch. 6.3 - Prob. 31ECh. 6.3 - Prob. 32ECh. 6.3 - In Problems 31-33, solve the given initial value...Ch. 6.3 - Prob. 34ECh. 6.3 - Prob. 35ECh. 6.3 - Use the annihilator method to show that if f(x) in...Ch. 6.3 - Prob. 37ECh. 6.3 - In Problems 38 and 39, use the elimination method...Ch. 6.3 - Prob. 39ECh. 6.4 - In Problems 1-6, use the method of variation of...Ch. 6.4 - Prob. 2ECh. 6.4 - In Problems 1-6, use the method of variation of...Ch. 6.4 - Prob. 4ECh. 6.4 - Prob. 5ECh. 6.4 - In Problems 1-6, use the method of variation of...Ch. 6.4 - Prob. 7ECh. 6.4 - Prob. 8ECh. 6.4 - Prob. 9ECh. 6.4 - Given that {x,x1,x4} is a fundamental solution set...Ch. 6.4 - Prob. 11ECh. 6.4 - Prob. 12ECh. 6.4 - Prob. 13ECh. 6.4 - Prob. 14ECh. 6.RP - Determine the intervals for which Theorem 1 on...Ch. 6.RP - Determine whether the given functions are linearly...Ch. 6.RP - Show that the set of functions...Ch. 6.RP - Find a general solution for the given differential...Ch. 6.RP - Find a general solution for the homogeneous linear...Ch. 6.RP - Prob. 6RPCh. 6.RP - Prob. 7RPCh. 6.RP - Use the annihilator method to determine the form...Ch. 6.RP - Find a general solution to the Cauchy-Euler...Ch. 6.RP - Find a general solution to the given Cauchy-Euler...
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