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OpenStudy (anonymous):
URGGGEEEENT! A set of 10 lamps burn throughout the year. A single lamp has an 80% (0.8) chance of failing during the year. What is the probability that either 6 or 7 lamps are working at the end of the year? I know I must use binomial distribution but I'm not exactly how - also in the binomial distribution formula, is the *n above r* thing permutation or combination?
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OpenStudy (anonymous):
This is the last thing I don't know how to do for my math exam that starts in 1 hour's time (but I have to get ready in 10 minutes' time to leave)
OpenStudy (anonymous):
Binomial distribution.
OpenStudy (anonymous):
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