Question

There are 5 items defective in a sample of 30 items. Find the probability that an item chosen at random from the sample is (i) defective, (ii) non-defective

Answer 1

probability of defective sample item=no. of possible outcomes /total no. of outcomes
=5/30=1/6
probability of non-defective sample item=no. of possible outcomes /total outcomes=25/30=5/6