Math 1313
Homework 22
Section 7.5
Use the following problems to answer questions 1 – 4.
Of 2,000 students surveyed, 90% indicated that they commute to school each day.
Of
those that commute to school each day, 83% spend more than $20 a week on gasoline.
Of those that do not commute to school each day, 98% indicated that they do not spend
more than $20 a week on gasoline.
A student surveyed is chosen at random.
1.
What is the probability that this student does not commute to school each day?
a.
0.0020
b.
0.0980
c.
0.4500
d.
0.9700
e.
0.1000
f.
None of the above.
2.
What is the probability that this student does not commute to school each day and
does not spend more than $20 a week on gas?
a.
0.0980
b.
0.1000
c.
0.1403
d.
0.0020
e.
0.0582
f.
None of the above.
3.
What is the probability that this student does spend more than $20 a week on gas,
given that he/she does commute to school each day?
a.
0.9700
b.
0.8300
c.
0.7470
d.
0.8900
e.
0.1034
f.
None of the above.
4.
What is the probability that this student does spend more than $20 a week on gas?
a.
0.7490
b.
0.8366
c.
0.7840
d.
0.9200
e.
0.0018
f.
None of the above.
Use the following problems to answer questions 5 and 6.
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 Fall '10
 AbdelnourAhmedZaid
 Math, $20, 60%

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