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SOLUTIONS
King Fahd University of Petroleum & Minerals
Department of Mathematics & Statistics
STAT319Term063Quiz2
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Question1. (3points)
Disks of polycarbonate plastic from a supplier are analyzed for scratch and shock resistance. The
results from 100 disks are summarized as follows:
Shock Resistance
Scratch Resistance
High
Law
Total
High
70
9
79
Law
16
5
21
Total
86
14
100
Let A denote the event that a disk has high shock resistance, and let B denote the event that a disk has
high scratch resistance. Determine the following probabilities:
a.
()
PA
86
0.86
100
⇒=
=
(1Point)
b.
PBA
70
70
100
0.8140
86
86
100
PA B
=
=
=
∩
(2Points)
Question2.(7Points)
Customers are used to evaluate preliminary product designs. In the past, 95% of highly successful
products received good reviews, 60% of moderately successful products received good reviews, and
10% of poor products received good reviews. In addition, 40% of products have been highly
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This note was uploaded on 03/02/2011 for the course STAT 319 taught by Professor Koko during the Spring '11 term at Mass Colleges.
 Spring '11
 koko
 Probability

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