2
$\begingroup$

I have a probability question, that's been bugging me for a while now:

We are given that defective items on display occur independently with probability 0.05. A random sample of 100 items is taken. Given that at least 99 of the sampled items are not defective, I want to find the probability that the first item sampled is not defective.

Please, how do I go about solving this question?

Thanks.

2 Answers 2