Pearson eText for Mathematics for Elementary Teachers with Activities -- Instant Access (Pearson+)
5th Edition
ISBN: 9780137442812
Author: Sybilla Beckmann
Publisher: PEARSON+
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Chapter 4.3, Problem 16P
If a roll of a certain kind of wrapping paper is unrolled, the wrapping paper forms a rectangle that is 3 feet wide and 20 feet long. The wrapping paper is to be covered with an array of ladybugs by repeating the design shown in Figure 4.25 1. (The arrows and the “3 inches,” “2 inches” are not part of the design; they show the dimensions of a portion of the design.) How many ladybugs will be on the wrapping paper? Explain your reasoning.
Figure 4.25 A ladybug design for wrapping paper.
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Students have asked these similar questions
4. [9 points] Assume that B, C, E are all 3 x 3 matrices such that
BC ==
-64
-1 0 3
4
4 4
-2
2
CB=-1-2
4
BE
-2 1 3
EC =
1
3 2 -7,
1
6
-6
2-5 -7
-2
Explicitly compute the following by hand. (I.e., write out the entries of the 3 × 3
matrix.)
(a) [3 points] B(E+C)
(b) [3 points] (E+B)C
(c) [3 points] ETBT
6.
Consider the matrices
G =
0
(3)
-3\
-3
2
and H =
-1
2
0
5
0
5
5
noting that H(:, 3) = 2H(:,1) + H(:, 2).
Is G invertible? Explain your answer.
Is H invertible? Explain your answer.
Use co-factor expansion to find the determinant of H. (Hint:
expand the 2nd or 3rd row)
B3 Consider X ~ Bern(p)
(a) Find Mx(t), the moment generating function of X.
iid
(b) If X1,..., Xn
Bern(p), find the MGF, say My (t) of
n
Y =
ΣΧ
(c) Using the fact that
i=1
n
lim (1
(1+2)"=
N→X
= e²
find limn→∞ My (t) in the case that p satisfies limn→∞ np = λ, say.
(d) State the distribution of Y in the case that n is not large, and the distribution of Y in
the limiting case described in the question.
Chapter 4 Solutions
Pearson eText for Mathematics for Elementary Teachers with Activities -- Instant Access (Pearson+)
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