Machine–X produces 50% of the total output and Machine-Y produces 75% of the total output. An average of 13 units out of a thousand goods manufactured by Machine-X and 4 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) 0.19	B) 0.16	C) 0.1	D) 0.05	E) 0.01
Suppose machine X produce 1000 units   total defective = 13   Machine Y then produces=1500 units   total defective=12   probability=25/2500= 
<gadget id="calculator">25/2500</gadget>
<output>1/100 = around 0.01</output>
0.01   Answer : 0.01
<result>E</result>
Machine–X produces 50% of the total output and Machine-Y produces 75% of the total output. An average of 13 units out of a thousand goods manufactured by Machine-X and 4 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?