Question

a lot of 20 bulbs contain 5 defective bulbs one bulb is drawn at random find the probability of
(a) the bulb is not defective
(b) suppose the bulb is not defective and not replacement ;then find the probability that the next bulb which is drawn is defective ​

Answer 1

Answer:

a) 0.25

b) 19

Step-by-step explanation:

a) number of bulbs- 20

defective bulbs- 5

chances of getting a defective bulb: 5/20= 1/4= 0.25

b) non defective bulbs in a, take one out then its 19 bulbs

number of events- 19

favorable number of events: 19-5=14

probability that bulb is not defective: 14/19