The probability that exactly 10 people will show up is 0.230
Let X measure the number of people (out of 12) who show up for a flight. For each passenger
we have a 90% chance of showing up, so X is a binomial random variable with n = 12 and p = 0.90.
(b) Everyone gets a seat when X ≤ 10. We have to find the probability when exactly 10 people show up for the flight , so we use the binomial probability for P(10)
∴ P(10) = [tex]C^{n} _{x} p^{x}(1-p)^{n-x}[/tex]
P(10) = 0.230
So , the probability that exactly 10 people show up for the flight is 0.230 .
learn more about binomial probability here :
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