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In a box there are 20 non-defective and ...

In a box there are 20 non-defective and some defective bulbs. If the probability that a bulb selected at random from the box found to be defective is `3//8` then, find the number of defective bulbs.

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The correct Answer is:
12
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PREMIERS PUBLISHERS-STATISTICS AND PROBABILITY -SOLUTION TO EXERCISE 8.3
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  4. Three unbiased coins are tossed once. Find the probability of getting ...

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  8. A bag contains 5 red balls, 6 white balls, 7 green balls, 8 black ball...

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  9. A bag contains 5 red balls, 6 white balls, 7 green balls, 8 black ball...

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  10. In a box there are 20 non-defective and some defective bulbs. If the p...

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  14. Some boys are playing a game, in which the stone thrown by them landin...

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