Probability word problems?!..
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Probability word problems?!..

[From: ] [author: ] [Date: 11-12-12] [Hit: ]
Southwest Air had 80 % of its flights arriving on time.A test is conducted by randomly selecting 11 Southwest flights and observing whether they arrive on time.Find the probability that exactly 4 flights arrive on time.-binomdist with n = 11, p = 0.8,......
The rates of on-time flights for commercial jets are continuously tracked by the U.S. Department of Transportation.
Recently, Southwest Air had 80 % of its flights arriving on time.
A test is conducted by randomly selecting 11 Southwest flights and observing whether they arrive on time.
Find the probability that exactly 4 flights arrive on time.

-
binomdist with n = 11, p = 0.8, q = 1-p = 0.2
P[x] = nCx *p^x *q^(n-x)

P[4] = 11c4 *0.8^4 *0.2^9 = .00173 <-------
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