In a box containing 60 bulbs, 6 are defective. What is the probability that out of a sample of 5 bulbs
(i) none is defective
(ii) exactly 2 are defective

(i) Using Bernoulli’s Trial Success

The probability of success, i.e. the bulb is defective

probability of that no bulb is defective piece=
defective items

(ii) Using Bernoulli’s Trial Success and
The probability of success, i.e. the bulb is defective

probability of that there are exactly 2 defective pieces=
defective items