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

Algebra ->  Probability-and-statistics -> 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      Log On


   

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) About Me  (Show Source):
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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: _%5Bn%5DC%5Bs%5D+%2A+p%5Es+%2A+q%5E%28n-s%29

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 highlight_green%28.171%29, or highlight_green%2817.1%29%.