In 2006, the median SAT score was the average of d 732 , 872 and d 732 , 873 , where { d 1 , d 2 , ⋅ ⋅ ⋅ , d N } denotes the data set of all SAT scores ordered from lowest to highest. Determine the number of students N who took the SAT in 2006.
In 2006, the median SAT score was the average of d 732 , 872 and d 732 , 873 , where { d 1 , d 2 , ⋅ ⋅ ⋅ , d N } denotes the data set of all SAT scores ordered from lowest to highest. Determine the number of students N who took the SAT in 2006.
Solution Summary: The author calculates that the number of students who took the SAT in 2006 is 1465744. The median is the 50th percentile of the data set.
In 2006, the median SAT score was the average of
d
732
,
872
and
d
732
,
873
, where
{
d
1
,
d
2
,
⋅
⋅
⋅
,
d
N
}
denotes the data set of all SAT scores ordered from lowest to highest. Determine the number of students
N
who took the SAT in 2006.
A factorization A = PDP 1 is not unique. For A=
7 2
-4 1
1
1
5 0
2
1
one factorization is P =
D=
and P-1
30
=
Use this information with D₁
=
to find a matrix P₁ such that
-
-1 -2
0 3
1
-
- 1
05
A-P,D,P
P1
(Type an integer or simplified fraction for each matrix element.)
Matrix A is factored in the form PDP 1. Use the Diagonalization Theorem to find the eigenvalues of A and a basis for each eigenspace.
30 -1
-
1 0 -1
400
0
0 1
A=
3 4 3
0 1 3
040
3 1 3
0 0
4
1
0
0
003
-1 0 -1
Select the correct choice below and fill in the answer boxes to complete your choice.
(Use a comma to separate vectors as needed.)
A basis for the corresponding eigenspace is {
A. There is one distinct eigenvalue, λ =
B. In ascending order, the two distinct eigenvalues are λ₁
...
=
and 2
=
Bases for the corresponding eigenspaces are {
and ( ), respectively.
C. In ascending order, the three distinct eigenvalues are λ₁ =
=
12/2
=
and 3 = Bases for the corresponding eigenspaces are
{}, }, and {
respectively.
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