Q. 29 A3.9( 9 Votes )

A lot of 20 bulbs

Answer :

Total numbers of elementary events are: 20

Let E be the event of drawing defective bulb


The number of defective bulbs in a lot = 4


Then, the favourable outcome =4


P (defective bulb) = P (E) = 4/20 = 1/5


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