SOLUTION:

Question 347866:
Found 3 solutions by stanbon, Fombitz, poliet:
Answer by stanbon(75887)   (Show Source): You can put this solution on YOUR website!
A bin contains 77 light bulbs of which 12 are defective. If 5 light bulbs are randomly selected from the bin with replacement, find the probability that all the bulbs selected are good ones. My original answer was .844 and it was wrong.
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Ans: (65/77)^5 = 0.4287
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Cheers,
Stan H.
Answer by Fombitz(32388)   (Show Source): You can put this solution on YOUR website!
So the bin has good, bad, total.
P(1st good)=
P(2nd good)=
P(3rd good)=
P(4th good)=
P(5th good)=
P(all good)=
P(all good)=
.
.
.
is the probability of picking the first good one out.
But you're doing it 5 times, so you need to multiply that value 5 times.

Answer by poliet(1)   (Show Source): You can put this solution on YOUR website!