It is known that a box of $200$ electric bulbs contains $16$ defective bulbs. One bulb is taken out at random from this box. What is the probability that it is a non-defective bulb?

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Solution

Total bulbs $= 200$
Defective $= 20$
Non defective $= 180$
Probability $= \frac{180}{200} = \frac{9}{10} = 0.9$ .

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It is known that a box of 200 electric bulbs contains 16 defective bulbs. One bulb is taken out at random from this box. What is the probability that it is a non-defective bulb?

Total bulbs =200Defective =20Non defective =180Probability =180200=910=0.9.

It is known that a box of $200$ electric bulbs contains $16$ defective bulbs. One bulb is taken out at random from this box. What is the probability that it is a non-defective bulb?

Total bulbs $= 200$
Defective $= 20$
Non defective $= 180$
Probability $= \frac{180}{200} = \frac{9}{10} = 0.9$ .