Twenty of the 50 digital video recorders (DVRs) in an inventory are known to be defective. What is the probability you randomly select an item that is not defective?
1 Answer
May 31, 2018
Explanation:
Remember that odds for plus odds against must be 1. Therefore, 20 out of 50 of the DVRs are defective, so 30 out of 50 would work.
I hope this helps, I know the explanation isn't really clear, but I can't really think of another way to explain it.