A lot consists of 144 ball pens of which 20 are defective and others good. Nuri will buy a pen if it is good, but will not buy if it is defective. The shopkeeper draws one pen at random and gives it to her. What is the probability that
(i) She will buy it?

(ii) She will not buy it?
Total number of possible outcomes, n(S) = 144

(i) Number of favorable outcomes, n(E) = 124

(ii) Probability of not buying a defective pen = 1 – P(E)

Question

Total number of possible outcomes, n(S) = 144

(i) Number of favorable outcomes, n(E) = 124

(ii) Probability of not buying a defective pen = 1 – P(E)

Philoid · Accepted Answer

Total number of possible outcomes, n(S) = 144

(i) Number of favorable outcomes, n(E) = 124

(ii) Probability of not buying a defective pen = 1 – P(E)