Question 272169: 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 reate with 80 % of its flights arriving on time. A test is conducted by randomly selecting 20 Southwest flights and observing whether they arrive on time. (a) Find the probability that at least 18 flights arrive on time.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! 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 reate with 80 % of its flights arriving on time. A test is conducted by randomly selecting 20 Southwest flights and observing whether they arrive on time.
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Binomial Problem with n = 20 ; p = 0.8
(a) Find the probability that at least 18 flights arrive on time.
P(18<= x <=20) = 1-binomcdf(20,0.8,17) = 0.2061
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Cheers,
Stan H.
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