Question

A manufacturer tested 7000 LED lights at random and found that 25 of them were defective. If a LED light is selected at random, what is the probability that the selected LED light is a defective one

Answer 1

Sample space n(S) = 7000

Let E₁ be the event of getting selected LED light is a defective one

n(E₁) = 25

p(E₁) = `("n"("E"_1))/("n"("S"))`

= `25/7000`

= `1/280`