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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