Hi,
-There are a total of 100,000 stuffed animals, 1 in 200 in defected p(defective) = .005
if the sample size is 20, what is the probability that it will have a defected piece in it?
Using TI calculator
The syntax is binompdf(n, p, x-value).
P(x = 1) = binompdf(20, .005, 1) = .0909 = 9.09%