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...

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 μ_{x=np? Please help by better explaining this.}

Extracted 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