Question

in a box containing 100 bulbs, 10 are defective . the probability that out of a sample of 5 bulbs none is defective is

Answer 1

5 /90 because 10 blub are defective one then we subtract 100-10

Answer 2

First of all I want to wish you a very happy new year


total number of balls present in box=100

Total number of defective balls=10

Remaining balls= 100-10=90(non defective)

Favourable outcome= 5

Possible outcome=90

probability= 5/90

=1/18