Question

on checking trunk containing bulbs it was found that there are 600 bulbs and 75 of them are defective find the probability of selecting a bulb at random which is non defective.

Answer 1

Number of defective bulbs = 75
Total number of bulbs = 600

Number of non defective bulbs
= 600-75
= 525

Probability = No. of favorable outcomes/Total number of outcomes

= 525/600
= 105/120
= 21/24
= 0.875
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Answer 2

no of bulbs = 600
no of defective bulbs= 75
no of bulbs working properly = 600-75=525
probability of selecting bulb which is non defective =525/600
=0.875