Machine–X produces 50% of the total output and Machine-Y produces 75% of the total output. An average of nine units out of a thousand goods manufactured by Machine-X and two unit of 500 units produced by Machine-X prove to be defective. What is the probability that a unit chosen at random from the total daily output of the factory is defective?  Answers:
A) 0.008	B) 0.1	C) 0.12	D) 0.006	E) 0.007
Suppose machine X produce 1000 units   total defective = 9   Machine Y then produces=1500 units   total defective=6   probability=15/2500= 
<gadget id="calculator">15/2500</gadget>
<output>3/500 = around 0.006</output>
0.006   Answer : 0.006
<result>D</result>
Machine–X produces 50% of the total output and Machine-Y produces 75% of the total output. An average of nine units out of a thousand goods manufactured by Machine-X and two unit of 500 units produced by Machine-X prove to be defective. What is the probability that a unit chosen at random from the total daily output of the factory is defective?