Evaluating the probability that at least 17 of the flights arrived on time: P(17)+P(18)+P(19)+P(20) P(17)-" C * 0.8317 * (1-0.83) P(20) .: C * 0.8320 * (1-0.83)。 = 1 * 0.8320 20! 1713! 18 19* 20 =-*0.83 *0.17 0.024 0.0421 0.004913 = 0.236 P(18) ซื้ C * 0.83s * (1-0.83)2 20 0.83 0.17 1812! 1920 0.035 0.0289 = 0, 1921 85 P19 0.8319 -0.83) 20 .3 0.17 911! 20* 0.029 0.17 0.0986

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At Phoenix Sky Harbor International Airport, 83% of recent flights have arrived on time. Suppose 20 flights are randomly selected.

  1. What is the probability that at least 17 of the flights arrived on time?

So I already had this question answered on this site, but I didn't understand what the person was doing. Is this binomcdf or binompdf? Which ones are the n, p, and x? Do I need to do 1-(17,.83, 20)? 

or is this μx=np? Please help by better explaining this. 

Evaluating the probability that at least 17 of the flights arrived on time:
P(17)+P(18)+P(19)+P(20)
P(17)-" C * 0.8317 * (1-0.83)
P(20) .: C * 0.8320 * (1-0.83)。
= 1 * 0.8320
20!
1713!
18 19* 20
=-*0.83
*0.17
0.024
0.0421 0.004913
= 0.236
P(18) ซื้ C * 0.83s * (1-0.83)2
20 0.83 0.17
1812!
1920
0.035 0.0289
= 0, 1921 85
P19 0.8319 -0.83)
20 .3 0.17
911!
20* 0.029 0.17
0.0986
Transcribed Image Text:Evaluating the probability that at least 17 of the flights arrived on time: P(17)+P(18)+P(19)+P(20) P(17)-" C * 0.8317 * (1-0.83) P(20) .: C * 0.8320 * (1-0.83)。 = 1 * 0.8320 20! 1713! 18 19* 20 =-*0.83 *0.17 0.024 0.0421 0.004913 = 0.236 P(18) ซื้ C * 0.83s * (1-0.83)2 20 0.83 0.17 1812! 1920 0.035 0.0289 = 0, 1921 85 P19 0.8319 -0.83) 20 .3 0.17 911! 20* 0.029 0.17 0.0986
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