Question

A lot consists of 144 ball pens of which 20 are defective, and the others are 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 but it? (ii) She will not buy it?

Answer 1

(i) P(probability She will buy it) =?

Sample Space = 144 ball pens

Good Pens = 144 – 20 = 124

Defective Pens = 20

(ii) P(She will not buy it) =?

Sample Space = 144 ball pens

Good Pens = 144 – 20 = 124

Defective Pens = 20