Question

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

Answer 1

Hola there..

According to the question,

Total no. of bulbs = 100

Defective bulbs = 30

Good bulbs = 100 - 30 = 70

Possible outcome = 70

Total no. of outcome = 100

P( getting a bulb to be good one) = 70/100

= 7/10

Hope this helps....:)

Answer 2

$number \: of \: bulbs = 100 \\ number \: of \: efective \: bulbs = 100 - 30 \\ = 70 \\ number \: of \: defective \: bulbs = 30 \\ p(selecting \: efective \: bulbs) = \frac{number \: of \: efective \: bulbs}{total \: number \: of \: bulbs} \\ = \frac{70}{100} \\ = \frac{7}{10} \\ = 0.7$

I hope this helps you

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