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grr i cant get this!!!?
An investor owns three common stocks. Each stock, independent of the others, has equally likely chances of (1) increasing in value, (2) decreasing in value, or (3) remaining the same value. Estimate the probability at least two of the stocks increase in value.
Estimate the probability at least two of the stocks increase in value.___
ive been working on this for a long time
2 Answers
- Anonymous1 decade agoFavorite Answer
Just draw a tree diagram :)
Okay, so we know each individual chance is 1/3. How many combinations can work?
112
113
121
131
211
311
Each one is worth 1/27 probability. 6 of them gives us 6/27 chance that at least 2 stocks will increase in value :)
- GuillermoLv 71 decade ago
At least two...
P(s1s2)+P(s1s3)+P(s2s3) + P(s1s2s3) = (1/3)*(1/3)*3 + (1/3)*(1/3)*(1/3) = 1/3 + 1/27 = 10/27