grr i cant get this!!!?

Question

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

Anonymous · Accepted 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 :)

Guillermo · Answer

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

grr i cant get this!!!?

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