posted by Jack .
Through a mix up on the production line, 5 defective light bulbs were shipped out with 32 good ones. If 4 are selected at random, what is the probability that at least 3 of them are defective?
This typically calls for the hypergeometric distribution, which gives
N=total 32+5=37 light bulbs
n=sample size of 4
r=defective out of N, 5
y=number of defective in the sample