Question

in a box there are 800 bulbs out of which 780 bulbs and non defective one bulb is taken out at random find the probability that the bulb is defective

Answer 1

Total outcomes favourable = 780
Total no of outcomes = 800

P( bulb is defective) = 780/800
= 78/80
= 39/40

Also = 0.975%

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Answer 2

hey mate here is your answer

GIVEN: total outcome=800
not defective bulb=780
defective=800-780=20

P(defective bulbs)= defective bulbs /total outcome

=20/800
=1/40
=0.025
alternative answer:

=1-P(not defective bulbs)
=1-780/800
=0.025

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