The following table shows the performance of a selection of 100 stocks after one year. (Take S to be the set of all stocks represented in the table.) Answer questions 8-10. Companies Pharmaceuticals Electronic Internet Total P E Increased 10 5 15 30 V Unchanged 30 10 40 Decreased 10 5 15 30 D Total 50 10 40 100 7. Find n(D U E) 8. If a stock is randomly selected, compute the probability that it is an internet stock that remained unchanged. 9. If a stock is randomly selected, compute the probability that it is a Pharmaceutical stock given that it's value decreased.

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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The following table shows the performance of a selection of 100 stocks after one year. (Take
S to be the set of all stocks represented in the table.) Answer questions 8-10.
Companies
Pharmaceuticals Electronic Internet Total
E
I
Increased
10
15
30
V
Unchanged
30
10
40
Decreased
10
15
30
D
Total
50
10
40
100
7. Find n(D U E)
8. If a stock is randomly selected, compute the probability that it is an internet stock that
remained unchanged.
9. If a stock is randomly selected, compute the probability that it is a Pharmaceutical stock
given that it's value decreased.
Transcribed Image Text:The following table shows the performance of a selection of 100 stocks after one year. (Take S to be the set of all stocks represented in the table.) Answer questions 8-10. Companies Pharmaceuticals Electronic Internet Total E I Increased 10 15 30 V Unchanged 30 10 40 Decreased 10 15 30 D Total 50 10 40 100 7. Find n(D U E) 8. If a stock is randomly selected, compute the probability that it is an internet stock that remained unchanged. 9. If a stock is randomly selected, compute the probability that it is a Pharmaceutical stock given that it's value decreased.
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