Question

In a bag,there are 100 bulb out of which 30 are defective once .a bulb is taken out of the bag at random. Find the probability of the selected bulb to be a good one

Answer 1

total number of event=100

no of defective bulb=30

probability of selected 1bulb is defective=100/30=10/3

Answer 2

No. of non-effective bulbs = (100/30)

                                           = 70 bulbs

So,

Total no. of outcomes=100

No. of favourable outcome = 70

So, P(getting a good bulb) = 70/100

                                           = 7/10

(Ans): The probability of getting a good bulb is 7/10.