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.
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.
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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 <-------
P[x] = nCx *p^x *q^(n-x)
P[4] = 11c4 *0.8^4 *0.2^9 = .00173 <-------