1.

A lot of 20 bulbs contain 4 defective bulbs. One bulb is drawn at random from the lot, what is the probability that this bulb is defective?

Answer»

Total defective bulbs in the lot = 4 

Total number of bulbs in the lot = 20. 

Now probability that drawn bulb is defective

\(\frac{Total \,defective\,bulbs\,in\, the\, lot}{Total\, number\, of\, bulbs\,in\, the\, lot} = \frac{4}{20} = \frac{1}{5}\)

Hence, the probability that drawn bulb is defective is \(\frac{1}{5}\)



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