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Q.

A box of 800 electric bulbs contains 180 defective bulbs, if one bulb is taken out at random from this box, then what is the probability that it is a non-defective bulb?


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a

31 64  

b

31 65  

c

31 40  

d

33 40   

answer is C.

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Detailed Solution

It is given that a box of 800 electric bulbs contains 180 defective bulbs and one bulb is taken out at random from this box, we have to find the probability that it is a non-defective bulb.
Required probability,
P= Number of trials in which the event E has happened  Total number of trials  
Write the given information,
Total number of electric bulbs in a box = 800.
180 faulty bulbs are present.
Number of non-defective bulbs = 800 - 180 = 620.
Let E = Event of getting a non-defective bulb.
Probability that the bulb is not defective,
⇒P E = 620 800   ⇒P E = 62 80 ⇒P E = 31 40   Hence, the probability that it is a non-defective bulb is 31 40   .
Therefore, option 3 is correct.
 
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