SOLUTION: I'm pretty good at probability, but can't figure this problem out. I can't find my notes and am reviewing for an exam! "If a teacher has a box of 10 expo markers and only half of

Question 748390: I'm pretty good at probability, but can't figure this problem out. I can't find my notes and am reviewing for an exam!
"If a teacher has a box of 10 expo markers and only half of them work, what is the probability that at least one of 3 randomly selected markers works?"
Answer by MathTherapy(10552) (Show Source): You can put this solution on YOUR website!

I'm pretty good at probability, but can't figure this problem out. I can't find my notes and am reviewing for an exam!
"If a teacher has a box of 10 expo markers and only half of them work, what is the probability that at least one of 3 randomly selected markers works?"

Binomial probability formula:

At least 1 of 3 means either 1, 2, or 3 will work, or P(1, 2, or 3), or P(1) + P(2), or P(3)

P(1) = 0.010

P(2) = 0.044

P(3) = 0.117

Probability that at least 1 of 3 will work = P(1) + P(2) + P(3), or 0.010 + 0.044 + 0.117, or , or %.
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