.30 7 40 and 8 .10 ese Compute E(y) b. Compute Var( y) and o. а. ari able. er of Applications e see coot of 17. The number of students taking the SAT has risen to an all-time high of more than 1.5 million (College Board, August 26, 2008). Students are allowed to repeat the test in hopes of improving the score that is sent to college and university admission offices. The number of times the SAT was taken and the number of students are as follows. day'is = 1.118 ewallo om vari- Number of terpret. Number of Students Times 1 721,769 601,325 166,736 22,299 6730 2 BILES UT3 4 5 ftr) а. Let x be a random variable indicating the number of times a student takes the SAT =4050 11 Show the probability distribution for this random variable. What is the probability that a student takes the SAT more than one time? What is the probability that a student takes the SAT three or more times? What is the expected value of the number of times the SAT is taken? What is your = .0975 ) = .0600 ) = .3150 b. с. d. 1) = 1225 1.2500 4)=2500 interpretation of the expected value? What is the variance and standard deviation for the number of times the SAT is taken? е. 18. SELF test The American Housing Survey reported the following data on the number of bedrooms in owner-occupied and renter-occupied houses in central cities (U.S. Census Bureau website, March 31, 2003).
.30 7 40 and 8 .10 ese Compute E(y) b. Compute Var( y) and o. а. ari able. er of Applications e see coot of 17. The number of students taking the SAT has risen to an all-time high of more than 1.5 million (College Board, August 26, 2008). Students are allowed to repeat the test in hopes of improving the score that is sent to college and university admission offices. The number of times the SAT was taken and the number of students are as follows. day'is = 1.118 ewallo om vari- Number of terpret. Number of Students Times 1 721,769 601,325 166,736 22,299 6730 2 BILES UT3 4 5 ftr) а. Let x be a random variable indicating the number of times a student takes the SAT =4050 11 Show the probability distribution for this random variable. What is the probability that a student takes the SAT more than one time? What is the probability that a student takes the SAT three or more times? What is the expected value of the number of times the SAT is taken? What is your = .0975 ) = .0600 ) = .3150 b. с. d. 1) = 1225 1.2500 4)=2500 interpretation of the expected value? What is the variance and standard deviation for the number of times the SAT is taken? е. 18. SELF test The American Housing Survey reported the following data on the number of bedrooms in owner-occupied and renter-occupied houses in central cities (U.S. Census Bureau website, March 31, 2003).
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Question 17, with problems worked through
Transcribed Image Text:.30
7
40
and
8
.10
ese
Compute E(y)
b. Compute Var( y) and o.
а.
ari
able.
er of
Applications
e see
coot of
17. The number of students taking the SAT has risen to an all-time high of more than
1.5 million (College Board, August 26, 2008). Students are allowed to repeat the test in
hopes of improving the score that is sent to college and university admission offices. The
number of times the SAT was taken and the number of students are as follows.
day'is
= 1.118
ewallo
om vari-
Number of
terpret.
Number of
Students
Times
1
721,769
601,325
166,736
22,299
6730
2
BILES
UT3
4
5
ftr)
а.
Let x be a random variable indicating the number of times a student takes the SAT
=4050
11
Show the probability distribution for this random variable.
What is the probability that a student takes the SAT more than one time?
What is the probability that a student takes the SAT three or more times?
What is the expected value of the number of times the SAT is taken? What is your
= .0975
) = .0600
) = .3150
b.
с.
d.
1) = 1225
1.2500
4)=2500
interpretation of the expected value?
What is the variance and standard deviation for the number of times the SAT is taken?
е.
18.
SELF test
The American Housing Survey reported the following data on the number of bedrooms in
owner-occupied and renter-occupied houses in central cities (U.S. Census Bureau website,
March 31, 2003).
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