Question

Five of the 100 digital video recorders (DVRs) in an inventory are known to be defective. What is the probability you randomly an item that is not defective?

Answer 1

the probability that randomly selected item that is not defective is
`P(E)=19/20`

Explanation:

given that in a total of `100` bulbs `5` are defective
let,the probability of selecting a defective bulb be `A` then
`P(A)=5/100=1/20`
the probability that it is not defective is `=1-1/20=19/20`