This preview shows pages 1–3. Sign up to view the full content.
Exam 2  Fall 2004  ST 370 Online/Distance  A
Darken the circle on the answer sheet corresponding to your answer. Use a number 2 pencil. Stray
marks on the form may cause errors. All questions are worth 5 points.
1. What is the probability that a standard normal random variable
Z
lies between

2
.
42 and 1.76?
(to 3 decimal places)
A. .953
B. .031
C. .005
D. .008
E. None of the above.
2. Consider a system having four independent components with reliabilities 0.90, 0.80, 0.95, and
.98. If the ﬁrst two components operate in parallel in a minisystem, the second two also operate in
parallel in a second minisystem, and the two minisystems are in series, then the system reliability
is (to 3 decimal places)
A. 0.556
B. 0.931
C. 0.709
D. 0.979
E. none of the above
3. Suppose that construction site fatalities occur at the rate of 2 per month in North Carolina.
What is the probability of two or more fatalities in June of the current year? (to 3 decimal places)
A. 0.735
B. 0.342
C. 0.406
D. 0.234
E. none of the above
4. Independence of two events
A
and
B
does not
imply that
A.
Pr
(
A
and
B
)=
(
A
)+
(
B
)
B.
(
B

A
(
B
)
C.
(
A
and
B
(
A
)
(
B
)
D.
(
A

B
(
A
).
E. None of the above
1
This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentUse the following information to answer the next 3 questions. Knee ﬂexion, a measure in degrees of
the knee range of motion, is normally distributed when measured on a large group of adult males.
This is the end of the preview. Sign up
to
access the rest of the document.
 Spring '08
 Nail

Click to edit the document details