Question

In a box there are 800 bulbs out of which 780 are non-defective. Find probability of defective bulbs?

Answer 1

total possible outcome = 800
probablity of defective bulb = 20
P(e)= 20/800
= 1/40

Answer 2

In a box there are 800 bulbs out of which 780 are non-defective. Find probability of defective bulbs?
solution=>800-780=20 are defective okay..
then p (e)=20/800=1/40 okay...^_^