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leca1994 leca1994
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10 years ago
I missed one lecture and now I'm so confused!

The rates of on-time flights for commercial jets are continuously tracked by the U.S Department of Transportation. Recently, Southwest Air had the best rate with 80% of its flights arriving on time. If 15 Southwest flights are randomly observed, find the probability that:

A) None are on time
B) All are on time
C) At least 10 are on time
D) No more than 4 are on time.

The answer in the back says:

A) P(0) = 0.000
B) P(15) - 0.0352
C) P(10) + P(11) +...+P(15)= 0.939
D) P(0)+P(1)...+P(4)= 0.000

I don't understand how to get these answers. I'm guessing it has something to do with nCr and factorials, but I'm not sure how to put it all together. Please help!
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dathadatha
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10 years ago
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