Q2) Two factories produce electric bulbs. factory B produce 3 Time of items of factory A each weak. factory A produce 7% defective bulbs while B 10% defective bulbs , Abulb is Selected randomly from all production of the two factories :- a) what is the prob. that the chosen bulb is defective? b) if abulk chosen is defective what is the prob. that it is from A ? c) if there are (1000) bulbs in abox how many defective bulbs are there